Alright, let's work through 3931 times 4644 step by step
3931 × 4644 = 4644 × (3931)
+ 4644 × 1 resulting in 4644
+ 4644 × 30 that results in 139320
+ 4644 × 900 yielding 4179600
+ 4644 × 3000 producing 13932000

= 18255564
