Alright, let's work through 3651 times 3990 step by step
3651 × 3990 = 3990 × (3651)
+ 3990 × 1 that is equal 3990
+ 3990 × 50 resulting in 199500
+ 3990 × 600 what gives us 2394000
+ 3990 × 3000 which equals 11970000

= 14567490
