Alright, let's work through 5157 times 5026 step by step
5157 × 5026 = 5026 × (5157)
+ 5026 × 7 yielding 35182
+ 5026 × 50 what gives us 251300
+ 5026 × 100 resulting in 502600
+ 5026 × 5000 resulting in 25130000

= 25919082
