Alright, let's work through 9911 times 6621 step by step
9911 × 6621 = 6621 × (9911)
+ 6621 × 1 that results in 6621
+ 6621 × 10 yielding 66210
+ 6621 × 900 producing 5958900
+ 6621 × 9000 that results in 59589000

= 65620731
