Alright, let's work through 6491 times 2560 step by step
6491 × 2560 = 2560 × (6491)
+ 2560 × 1 yielding 2560
+ 2560 × 90 what gives us 230400
+ 2560 × 400 that is equal 1024000
+ 2560 × 6000 which equals 15360000

= 16616960
