No problem, we've got 3600 and 1531 to multiply
3600 × 1531 = 1531 × (3600)
+ 1531 × 0 that is equal 0
+ 1531 × 00 what gives us 0
+ 1531 × 600 that is equal 918600
+ 1531 × 3000 that is equal 4593000

= 5511600
