Alright, let's work through 3951 times 4491 step by step
3951 × 4491 = 4491 × (3951)
+ 4491 × 1 giving us 4491
+ 4491 × 50 that is equal 224550
+ 4491 × 900 which equals 4041900
+ 4491 × 3000 resulting in 13473000

= 17743941
