Alright, let's work through 2457 times 8137 step by step
2457 × 8137 = 8137 × (2457)
+ 8137 × 7 resulting in 56959
+ 8137 × 50 that results in 406850
+ 8137 × 400 that is equal 3254800
+ 8137 × 2000 yielding 16274000

= 19992609
