Alright, let's work through 6645 times 3554 step by step
6645 × 3554 = 3554 × (6645)
+ 3554 × 5 what gives us 17770
+ 3554 × 40 yielding 142160
+ 3554 × 600 giving us 2132400
+ 3554 × 6000 giving us 21324000

= 23616330
