Alright, let's work through 3998 times 6481 step by step
3998 × 6481 = 6481 × (3998)
+ 6481 × 8 that results in 51848
+ 6481 × 90 producing 583290
+ 6481 × 900 that is equal 5832900
+ 6481 × 3000 that results in 19443000

= 25911038
