Alright, let's work through 3621 times 3583 step by step
3621 × 3583 = 3583 × (3621)
+ 3583 × 1 yielding 3583
+ 3583 × 20 resulting in 71660
+ 3583 × 600 giving us 2149800
+ 3583 × 3000 that results in 10749000

= 12974043
