Alright, let's work through 8641 times 8591 step by step
8641 × 8591 = 8591 × (8641)
+ 8591 × 1 which equals 8591
+ 8591 × 40 producing 343640
+ 8591 × 600 that results in 5154600
+ 8591 × 8000 what gives us 68728000

= 74234831
