Alright, let's work through 3906 times 1581 step by step
3906 × 1581 = 1581 × (3906)
+ 1581 × 6 what gives us 9486
+ 1581 × 00 that results in 0
+ 1581 × 900 yielding 1422900
+ 1581 × 3000 yielding 4743000

= 6175386
