No problem, we've got 1646 and 656 to multiply
1646 × 656 = 656 × (1646)
+ 656 × 6 that is equal 3936
+ 656 × 40 which equals 26240
+ 656 × 600 that is equal 393600
+ 656 × 1000 resulting in 656000

= 1079776
