Alright, let's work through 3659 times 641 step by step
3659 × 641 = 641 × (3659)
+ 641 × 9 yielding 5769
+ 641 × 50 that results in 32050
+ 641 × 600 producing 384600
+ 641 × 3000 which equals 1923000

= 2345419
