Alright, let's work through 3981 times 2192 step by step
3981 × 2192 = 2192 × (3981)
+ 2192 × 1 what gives us 2192
+ 2192 × 80 producing 175360
+ 2192 × 900 yielding 1972800
+ 2192 × 3000 that results in 6576000

= 8726352
