No problem, we've got 6423 and 6656 to multiply
6423 × 6656 = 6656 × (6423)
+ 6656 × 3 giving us 19968
+ 6656 × 20 which equals 133120
+ 6656 × 400 that is equal 2662400
+ 6656 × 6000 resulting in 39936000

= 42751488
