Alright, let's work through 3988 times 6602 step by step
3988 × 6602 = 6602 × (3988)
+ 6602 × 8 producing 52816
+ 6602 × 80 giving us 528160
+ 6602 × 900 which equals 5941800
+ 6602 × 3000 what gives us 19806000

= 26328776
