Alright, let's solve this math problem step by step. First, we have the number 657. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 406. So, we're going to take the number 657 and add it to itself 406 times.
Step 1: 0 + 657 = 657
Step 2: 657 + 657 = 1314
Step 3: 1314 + 657 = 1971
Step 4: 1971 + 657 = 2628
Step 5: 2628 + 657 = 3285
Step 6: 3285 + 657 = 3942
Step 7: 3942 + 657 = 4599
Step 8: 4599 + 657 = 5256
Step 9: 5256 + 657 = 5913
Step 10: 5913 + 657 = 6570
Step 11: 6570 + 657 = 7227
Step 12: 7227 + 657 = 7884
Step 13: 7884 + 657 = 8541
Step 14: 8541 + 657 = 9198
Step 15: 9198 + 657 = 9855
Step 16: 9855 + 657 = 10512
Step 17: 10512 + 657 = 11169
Step 18: 11169 + 657 = 11826
Step 19: 11826 + 657 = 12483
Step 20: 12483 + 657 = 13140
Step 21: 13140 + 657 = 13797
Step 22: 13797 + 657 = 14454
Step 23: 14454 + 657 = 15111
Step 24: 15111 + 657 = 15768
Step 25: 15768 + 657 = 16425
Step 26: 16425 + 657 = 17082
Step 27: 17082 + 657 = 17739
Step 28: 17739 + 657 = 18396
Step 29: 18396 + 657 = 19053
Step 30: 19053 + 657 = 19710
Step 31: 19710 + 657 = 20367
Step 32: 20367 + 657 = 21024
Step 33: 21024 + 657 = 21681
Step 34: 21681 + 657 = 22338
Step 35: 22338 + 657 = 22995
Step 36: 22995 + 657 = 23652
Step 37: 23652 + 657 = 24309
Step 38: 24309 + 657 = 24966
Step 39: 24966 + 657 = 25623
Step 40: 25623 + 657 = 26280
Step 41: 26280 + 657 = 26937
Step 42: 26937 + 657 = 27594
Step 43: 27594 + 657 = 28251
Step 44: 28251 + 657 = 28908
Step 45: 28908 + 657 = 29565
Step 46: 29565 + 657 = 30222
Step 47: 30222 + 657 = 30879
Step 48: 30879 + 657 = 31536
Step 49: 31536 + 657 = 32193
Step 50: 32193 + 657 = 32850
Step 51: 32850 + 657 = 33507
Step 52: 33507 + 657 = 34164
Step 53: 34164 + 657 = 34821
Step 54: 34821 + 657 = 35478
Step 55: 35478 + 657 = 36135
Step 56: 36135 + 657 = 36792
Step 57: 36792 + 657 = 37449
Step 58: 37449 + 657 = 38106
Step 59: 38106 + 657 = 38763
Step 60: 38763 + 657 = 39420
Step 61: 39420 + 657 = 40077
Step 62: 40077 + 657 = 40734
Step 63: 40734 + 657 = 41391
Step 64: 41391 + 657 = 42048
Step 65: 42048 + 657 = 42705
Step 66: 42705 + 657 = 43362
Step 67: 43362 + 657 = 44019
Step 68: 44019 + 657 = 44676
Step 69: 44676 + 657 = 45333
Step 70: 45333 + 657 = 45990
Step 71: 45990 + 657 = 46647
Step 72: 46647 + 657 = 47304
Step 73: 47304 + 657 = 47961
Step 74: 47961 + 657 = 48618
Step 75: 48618 + 657 = 49275
Step 76: 49275 + 657 = 49932
Step 77: 49932 + 657 = 50589
Step 78: 50589 + 657 = 51246
Step 79: 51246 + 657 = 51903
Step 80: 51903 + 657 = 52560
Step 81: 52560 + 657 = 53217
Step 82: 53217 + 657 = 53874
Step 83: 53874 + 657 = 54531
Step 84: 54531 + 657 = 55188
Step 85: 55188 + 657 = 55845
Step 86: 55845 + 657 = 56502
Step 87: 56502 + 657 = 57159
Step 88: 57159 + 657 = 57816
Step 89: 57816 + 657 = 58473
Step 90: 58473 + 657 = 59130
Step 91: 59130 + 657 = 59787
Step 92: 59787 + 657 = 60444
Step 93: 60444 + 657 = 61101
Step 94: 61101 + 657 = 61758
Step 95: 61758 + 657 = 62415
Step 96: 62415 + 657 = 63072
Step 97: 63072 + 657 = 63729
Step 98: 63729 + 657 = 64386
Step 99: 64386 + 657 = 65043
Step 100: 65043 + 657 = 65700
Step 101: 65700 + 657 = 66357
Step 102: 66357 + 657 = 67014
Step 103: 67014 + 657 = 67671
Step 104: 67671 + 657 = 68328
Step 105: 68328 + 657 = 68985
Step 106: 68985 + 657 = 69642
Step 107: 69642 + 657 = 70299
Step 108: 70299 + 657 = 70956
Step 109: 70956 + 657 = 71613
Step 110: 71613 + 657 = 72270
Step 111: 72270 + 657 = 72927
Step 112: 72927 + 657 = 73584
Step 113: 73584 + 657 = 74241
Step 114: 74241 + 657 = 74898
Step 115: 74898 + 657 = 75555
Step 116: 75555 + 657 = 76212
Step 117: 76212 + 657 = 76869
Step 118: 76869 + 657 = 77526
Step 119: 77526 + 657 = 78183
Step 120: 78183 + 657 = 78840
Step 121: 78840 + 657 = 79497
Step 122: 79497 + 657 = 80154
Step 123: 80154 + 657 = 80811
Step 124: 80811 + 657 = 81468
Step 125: 81468 + 657 = 82125
Step 126: 82125 + 657 = 82782
Step 127: 82782 + 657 = 83439
Step 128: 83439 + 657 = 84096
Step 129: 84096 + 657 = 84753
Step 130: 84753 + 657 = 85410
Step 131: 85410 + 657 = 86067
Step 132: 86067 + 657 = 86724
Step 133: 86724 + 657 = 87381
Step 134: 87381 + 657 = 88038
Step 135: 88038 + 657 = 88695
Step 136: 88695 + 657 = 89352
Step 137: 89352 + 657 = 90009
Step 138: 90009 + 657 = 90666
Step 139: 90666 + 657 = 91323
Step 140: 91323 + 657 = 91980
Step 141: 91980 + 657 = 92637
Step 142: 92637 + 657 = 93294
Step 143: 93294 + 657 = 93951
Step 144: 93951 + 657 = 94608
Step 145: 94608 + 657 = 95265
Step 146: 95265 + 657 = 95922
Step 147: 95922 + 657 = 96579
Step 148: 96579 + 657 = 97236
Step 149: 97236 + 657 = 97893
Step 150: 97893 + 657 = 98550
Step 151: 98550 + 657 = 99207
Step 152: 99207 + 657 = 99864
Step 153: 99864 + 657 = 100521
Step 154: 100521 + 657 = 101178
Step 155: 101178 + 657 = 101835
Step 156: 101835 + 657 = 102492
Step 157: 102492 + 657 = 103149
Step 158: 103149 + 657 = 103806
Step 159: 103806 + 657 = 104463
Step 160: 104463 + 657 = 105120
Step 161: 105120 + 657 = 105777
Step 162: 105777 + 657 = 106434
Step 163: 106434 + 657 = 107091
Step 164: 107091 + 657 = 107748
Step 165: 107748 + 657 = 108405
Step 166: 108405 + 657 = 109062
Step 167: 109062 + 657 = 109719
Step 168: 109719 + 657 = 110376
Step 169: 110376 + 657 = 111033
Step 170: 111033 + 657 = 111690
Step 171: 111690 + 657 = 112347
Step 172: 112347 + 657 = 113004
Step 173: 113004 + 657 = 113661
Step 174: 113661 + 657 = 114318
Step 175: 114318 + 657 = 114975
Step 176: 114975 + 657 = 115632
Step 177: 115632 + 657 = 116289
Step 178: 116289 + 657 = 116946
Step 179: 116946 + 657 = 117603
Step 180: 117603 + 657 = 118260
Step 181: 118260 + 657 = 118917
Step 182: 118917 + 657 = 119574
Step 183: 119574 + 657 = 120231
Step 184: 120231 + 657 = 120888
Step 185: 120888 + 657 = 121545
Step 186: 121545 + 657 = 122202
Step 187: 122202 + 657 = 122859
Step 188: 122859 + 657 = 123516
Step 189: 123516 + 657 = 124173
Step 190: 124173 + 657 = 124830
Step 191: 124830 + 657 = 125487
Step 192: 125487 + 657 = 126144
Step 193: 126144 + 657 = 126801
Step 194: 126801 + 657 = 127458
Step 195: 127458 + 657 = 128115
Step 196: 128115 + 657 = 128772
Step 197: 128772 + 657 = 129429
Step 198: 129429 + 657 = 130086
Step 199: 130086 + 657 = 130743
Step 200: 130743 + 657 = 131400
Step 201: 131400 + 657 = 132057
Step 202: 132057 + 657 = 132714
Step 203: 132714 + 657 = 133371
Step 204: 133371 + 657 = 134028
Step 205: 134028 + 657 = 134685
Step 206: 134685 + 657 = 135342
Step 207: 135342 + 657 = 135999
Step 208: 135999 + 657 = 136656
Step 209: 136656 + 657 = 137313
Step 210: 137313 + 657 = 137970
Step 211: 137970 + 657 = 138627
Step 212: 138627 + 657 = 139284
Step 213: 139284 + 657 = 139941
Step 214: 139941 + 657 = 140598
Step 215: 140598 + 657 = 141255
Step 216: 141255 + 657 = 141912
Step 217: 141912 + 657 = 142569
Step 218: 142569 + 657 = 143226
Step 219: 143226 + 657 = 143883
Step 220: 143883 + 657 = 144540
Step 221: 144540 + 657 = 145197
Step 222: 145197 + 657 = 145854
Step 223: 145854 + 657 = 146511
Step 224: 146511 + 657 = 147168
Step 225: 147168 + 657 = 147825
Step 226: 147825 + 657 = 148482
Step 227: 148482 + 657 = 149139
Step 228: 149139 + 657 = 149796
Step 229: 149796 + 657 = 150453
Step 230: 150453 + 657 = 151110
Step 231: 151110 + 657 = 151767
Step 232: 151767 + 657 = 152424
Step 233: 152424 + 657 = 153081
Step 234: 153081 + 657 = 153738
Step 235: 153738 + 657 = 154395
Step 236: 154395 + 657 = 155052
Step 237: 155052 + 657 = 155709
Step 238: 155709 + 657 = 156366
Step 239: 156366 + 657 = 157023
Step 240: 157023 + 657 = 157680
Step 241: 157680 + 657 = 158337
Step 242: 158337 + 657 = 158994
Step 243: 158994 + 657 = 159651
Step 244: 159651 + 657 = 160308
Step 245: 160308 + 657 = 160965
Step 246: 160965 + 657 = 161622
Step 247: 161622 + 657 = 162279
Step 248: 162279 + 657 = 162936
Step 249: 162936 + 657 = 163593
Step 250: 163593 + 657 = 164250
Step 251: 164250 + 657 = 164907
Step 252: 164907 + 657 = 165564
Step 253: 165564 + 657 = 166221
Step 254: 166221 + 657 = 166878
Step 255: 166878 + 657 = 167535
Step 256: 167535 + 657 = 168192
Step 257: 168192 + 657 = 168849
Step 258: 168849 + 657 = 169506
Step 259: 169506 + 657 = 170163
Step 260: 170163 + 657 = 170820
Step 261: 170820 + 657 = 171477
Step 262: 171477 + 657 = 172134
Step 263: 172134 + 657 = 172791
Step 264: 172791 + 657 = 173448
Step 265: 173448 + 657 = 174105
Step 266: 174105 + 657 = 174762
Step 267: 174762 + 657 = 175419
Step 268: 175419 + 657 = 176076
Step 269: 176076 + 657 = 176733
Step 270: 176733 + 657 = 177390
Step 271: 177390 + 657 = 178047
Step 272: 178047 + 657 = 178704
Step 273: 178704 + 657 = 179361
Step 274: 179361 + 657 = 180018
Step 275: 180018 + 657 = 180675
Step 276: 180675 + 657 = 181332
Step 277: 181332 + 657 = 181989
Step 278: 181989 + 657 = 182646
Step 279: 182646 + 657 = 183303
Step 280: 183303 + 657 = 183960
Step 281: 183960 + 657 = 184617
Step 282: 184617 + 657 = 185274
Step 283: 185274 + 657 = 185931
Step 284: 185931 + 657 = 186588
Step 285: 186588 + 657 = 187245
Step 286: 187245 + 657 = 187902
Step 287: 187902 + 657 = 188559
Step 288: 188559 + 657 = 189216
Step 289: 189216 + 657 = 189873
Step 290: 189873 + 657 = 190530
Step 291: 190530 + 657 = 191187
Step 292: 191187 + 657 = 191844
Step 293: 191844 + 657 = 192501
Step 294: 192501 + 657 = 193158
Step 295: 193158 + 657 = 193815
Step 296: 193815 + 657 = 194472
Step 297: 194472 + 657 = 195129
Step 298: 195129 + 657 = 195786
Step 299: 195786 + 657 = 196443
Step 300: 196443 + 657 = 197100
Step 301: 197100 + 657 = 197757
Step 302: 197757 + 657 = 198414
Step 303: 198414 + 657 = 199071
Step 304: 199071 + 657 = 199728
Step 305: 199728 + 657 = 200385
Step 306: 200385 + 657 = 201042
Step 307: 201042 + 657 = 201699
Step 308: 201699 + 657 = 202356
Step 309: 202356 + 657 = 203013
Step 310: 203013 + 657 = 203670
Step 311: 203670 + 657 = 204327
Step 312: 204327 + 657 = 204984
Step 313: 204984 + 657 = 205641
Step 314: 205641 + 657 = 206298
Step 315: 206298 + 657 = 206955
Step 316: 206955 + 657 = 207612
Step 317: 207612 + 657 = 208269
Step 318: 208269 + 657 = 208926
Step 319: 208926 + 657 = 209583
Step 320: 209583 + 657 = 210240
Step 321: 210240 + 657 = 210897
Step 322: 210897 + 657 = 211554
Step 323: 211554 + 657 = 212211
Step 324: 212211 + 657 = 212868
Step 325: 212868 + 657 = 213525
Step 326: 213525 + 657 = 214182
Step 327: 214182 + 657 = 214839
Step 328: 214839 + 657 = 215496
Step 329: 215496 + 657 = 216153
Step 330: 216153 + 657 = 216810
Step 331: 216810 + 657 = 217467
Step 332: 217467 + 657 = 218124
Step 333: 218124 + 657 = 218781
Step 334: 218781 + 657 = 219438
Step 335: 219438 + 657 = 220095
Step 336: 220095 + 657 = 220752
Step 337: 220752 + 657 = 221409
Step 338: 221409 + 657 = 222066
Step 339: 222066 + 657 = 222723
Step 340: 222723 + 657 = 223380
Step 341: 223380 + 657 = 224037
Step 342: 224037 + 657 = 224694
Step 343: 224694 + 657 = 225351
Step 344: 225351 + 657 = 226008
Step 345: 226008 + 657 = 226665
Step 346: 226665 + 657 = 227322
Step 347: 227322 + 657 = 227979
Step 348: 227979 + 657 = 228636
Step 349: 228636 + 657 = 229293
Step 350: 229293 + 657 = 229950
Step 351: 229950 + 657 = 230607
Step 352: 230607 + 657 = 231264
Step 353: 231264 + 657 = 231921
Step 354: 231921 + 657 = 232578
Step 355: 232578 + 657 = 233235
Step 356: 233235 + 657 = 233892
Step 357: 233892 + 657 = 234549
Step 358: 234549 + 657 = 235206
Step 359: 235206 + 657 = 235863
Step 360: 235863 + 657 = 236520
Step 361: 236520 + 657 = 237177
Step 362: 237177 + 657 = 237834
Step 363: 237834 + 657 = 238491
Step 364: 238491 + 657 = 239148
Step 365: 239148 + 657 = 239805
Step 366: 239805 + 657 = 240462
Step 367: 240462 + 657 = 241119
Step 368: 241119 + 657 = 241776
Step 369: 241776 + 657 = 242433
Step 370: 242433 + 657 = 243090
Step 371: 243090 + 657 = 243747
Step 372: 243747 + 657 = 244404
Step 373: 244404 + 657 = 245061
Step 374: 245061 + 657 = 245718
Step 375: 245718 + 657 = 246375
Step 376: 246375 + 657 = 247032
Step 377: 247032 + 657 = 247689
Step 378: 247689 + 657 = 248346
Step 379: 248346 + 657 = 249003
Step 380: 249003 + 657 = 249660
Step 381: 249660 + 657 = 250317
Step 382: 250317 + 657 = 250974
Step 383: 250974 + 657 = 251631
Step 384: 251631 + 657 = 252288
Step 385: 252288 + 657 = 252945
Step 386: 252945 + 657 = 253602
Step 387: 253602 + 657 = 254259
Step 388: 254259 + 657 = 254916
Step 389: 254916 + 657 = 255573
Step 390: 255573 + 657 = 256230
Step 391: 256230 + 657 = 256887
Step 392: 256887 + 657 = 257544
Step 393: 257544 + 657 = 258201
Step 394: 258201 + 657 = 258858
Step 395: 258858 + 657 = 259515
Step 396: 259515 + 657 = 260172
Step 397: 260172 + 657 = 260829
Step 398: 260829 + 657 = 261486
Step 399: 261486 + 657 = 262143
Step 400: 262143 + 657 = 262800
Step 401: 262800 + 657 = 263457
Step 402: 263457 + 657 = 264114
Step 403: 264114 + 657 = 264771
Step 404: 264771 + 657 = 265428
Step 405: 265428 + 657 = 266085
Step 406: 266085 + 657 = 266742

So, 657*406 = 266742