No problem, we've got 1401 and 3621 to multiply
1401 × 3621 = 3621 × (1401)
+ 3621 × 1 giving us 3621
+ 3621 × 00 resulting in 0
+ 3621 × 400 resulting in 1448400
+ 3621 × 1000 resulting in 3621000

= 5073021
