No problem, we've got 5621 and 5605 to multiply
5621 × 5605 = 5605 × (5621)
+ 5605 × 1 that results in 5605
+ 5605 × 20 what gives us 112100
+ 5605 × 600 that results in 3363000
+ 5605 × 5000 resulting in 28025000

= 31505705
