Alright, let's work through 3998 times 6886 step by step
3998 × 6886 = 6886 × (3998)
+ 6886 × 8 which equals 55088
+ 6886 × 90 that results in 619740
+ 6886 × 900 producing 6197400
+ 6886 × 3000 giving us 20658000

= 27530228
