Alright, let's work through 6642 times 591 step by step
6642 × 591 = 591 × (6642)
+ 591 × 2 what gives us 1182
+ 591 × 40 what gives us 23640
+ 591 × 600 resulting in 354600
+ 591 × 6000 giving us 3546000

= 3925422
