Alright, let's work through 6541 times 642 step by step
6541 × 642 = 642 × (6541)
+ 642 × 1 yielding 642
+ 642 × 40 which equals 25680
+ 642 × 500 that is equal 321000
+ 642 × 6000 what gives us 3852000

= 4199322
