Alright, let's work through 6602 times 2521 step by step
6602 × 2521 = 2521 × (6602)
+ 2521 × 2 that is equal 5042
+ 2521 × 00 that results in 0
+ 2521 × 600 producing 1512600
+ 2521 × 6000 resulting in 15126000

= 16643642
