Alright, let's work through 3997 times 637 step by step
3997 × 637 = 637 × (3997)
+ 637 × 7 that is equal 4459
+ 637 × 90 that equals 57330
+ 637 × 900 giving us 573300
+ 637 × 3000 that is equal 1911000

= 2546089
