Alright, let's work through 2501 times 5405 step by step
2501 × 5405 = 5405 × (2501)
+ 5405 × 1 which equals 5405
+ 5405 × 00 yielding 0
+ 5405 × 500 resulting in 2702500
+ 5405 × 2000 yielding 10810000

= 13517905
