Alright, let's work through 7991 times 9489 step by step
7991 × 9489 = 9489 × (7991)
+ 9489 × 1 yielding 9489
+ 9489 × 90 which equals 854010
+ 9489 × 900 yielding 8540100
+ 9489 × 7000 which equals 66423000

= 75826599
