Alright, let's work through 2637 times 2551 step by step
2637 × 2551 = 2551 × (2637)
+ 2551 × 7 giving us 17857
+ 2551 × 30 yielding 76530
+ 2551 × 600 producing 1530600
+ 2551 × 2000 that is equal 5102000

= 6726987
