Alright, let's work through 6347 times 2557 step by step
6347 × 2557 = 2557 × (6347)
+ 2557 × 7 that is equal 17899
+ 2557 × 40 that results in 102280
+ 2557 × 300 which equals 767100
+ 2557 × 6000 yielding 15342000

= 16229279
