Alright, let's work through 3665 times 3566 step by step
3665 × 3566 = 3566 × (3665)
+ 3566 × 5 which equals 17830
+ 3566 × 60 that is equal 213960
+ 3566 × 600 producing 2139600
+ 3566 × 3000 giving us 10698000

= 13069390
