Alright, let's work through 2603 times 6251 step by step
2603 × 6251 = 6251 × (2603)
+ 6251 × 3 yielding 18753
+ 6251 × 00 yielding 0
+ 6251 × 600 resulting in 3750600
+ 6251 × 2000 that results in 12502000

= 16271353
