Alright, let's work through 3091 times 6901 step by step
3091 × 6901 = 6901 × (3091)
+ 6901 × 1 that equals 6901
+ 6901 × 90 that results in 621090
+ 6901 × 000 what gives us 0
+ 6901 × 3000 producing 20703000

= 21330991
