Alright, let's work through 6243 times 2540 step by step
6243 × 2540 = 2540 × (6243)
+ 2540 × 3 which equals 7620
+ 2540 × 40 what gives us 101600
+ 2540 × 200 what gives us 508000
+ 2540 × 6000 producing 15240000

= 15857220
