Alright, let's work through 5641 times 3598 step by step
5641 × 3598 = 3598 × (5641)
+ 3598 × 1 which equals 3598
+ 3598 × 40 what gives us 143920
+ 3598 × 600 yielding 2158800
+ 3598 × 5000 that equals 17990000

= 20296318
