Alright, let's work through 3881 times 1066 step by step
3881 × 1066 = 1066 × (3881)
+ 1066 × 1 that is equal 1066
+ 1066 × 80 producing 85280
+ 1066 × 800 resulting in 852800
+ 1066 × 3000 producing 3198000

= 4137146
