Alright, let's solve this math problem step by step. First, we have the number 591. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 66. So, we're going to take the number 591 and add it to itself 66 times.
Step 1: 0 + 591 = 591
Step 2: 591 + 591 = 1182
Step 3: 1182 + 591 = 1773
Step 4: 1773 + 591 = 2364
Step 5: 2364 + 591 = 2955
Step 6: 2955 + 591 = 3546
Step 7: 3546 + 591 = 4137
Step 8: 4137 + 591 = 4728
Step 9: 4728 + 591 = 5319
Step 10: 5319 + 591 = 5910
Step 11: 5910 + 591 = 6501
Step 12: 6501 + 591 = 7092
Step 13: 7092 + 591 = 7683
Step 14: 7683 + 591 = 8274
Step 15: 8274 + 591 = 8865
Step 16: 8865 + 591 = 9456
Step 17: 9456 + 591 = 10047
Step 18: 10047 + 591 = 10638
Step 19: 10638 + 591 = 11229
Step 20: 11229 + 591 = 11820
Step 21: 11820 + 591 = 12411
Step 22: 12411 + 591 = 13002
Step 23: 13002 + 591 = 13593
Step 24: 13593 + 591 = 14184
Step 25: 14184 + 591 = 14775
Step 26: 14775 + 591 = 15366
Step 27: 15366 + 591 = 15957
Step 28: 15957 + 591 = 16548
Step 29: 16548 + 591 = 17139
Step 30: 17139 + 591 = 17730
Step 31: 17730 + 591 = 18321
Step 32: 18321 + 591 = 18912
Step 33: 18912 + 591 = 19503
Step 34: 19503 + 591 = 20094
Step 35: 20094 + 591 = 20685
Step 36: 20685 + 591 = 21276
Step 37: 21276 + 591 = 21867
Step 38: 21867 + 591 = 22458
Step 39: 22458 + 591 = 23049
Step 40: 23049 + 591 = 23640
Step 41: 23640 + 591 = 24231
Step 42: 24231 + 591 = 24822
Step 43: 24822 + 591 = 25413
Step 44: 25413 + 591 = 26004
Step 45: 26004 + 591 = 26595
Step 46: 26595 + 591 = 27186
Step 47: 27186 + 591 = 27777
Step 48: 27777 + 591 = 28368
Step 49: 28368 + 591 = 28959
Step 50: 28959 + 591 = 29550
Step 51: 29550 + 591 = 30141
Step 52: 30141 + 591 = 30732
Step 53: 30732 + 591 = 31323
Step 54: 31323 + 591 = 31914
Step 55: 31914 + 591 = 32505
Step 56: 32505 + 591 = 33096
Step 57: 33096 + 591 = 33687
Step 58: 33687 + 591 = 34278
Step 59: 34278 + 591 = 34869
Step 60: 34869 + 591 = 35460
Step 61: 35460 + 591 = 36051
Step 62: 36051 + 591 = 36642
Step 63: 36642 + 591 = 37233
Step 64: 37233 + 591 = 37824
Step 65: 37824 + 591 = 38415
Step 66: 38415 + 591 = 39006

So, 591*66 = 39006