No problem, we've got 1089 and 3665 to multiply
1089 × 3665 = 3665 × (1089)
+ 3665 × 9 yielding 32985
+ 3665 × 80 what gives us 293200
+ 3665 × 000 what gives us 0
+ 3665 × 1000 that is equal 3665000

= 3991185
