Alright, let's work through 2157 times 7187 step by step
2157 × 7187 = 7187 × (2157)
+ 7187 × 7 that is equal 50309
+ 7187 × 50 yielding 359350
+ 7187 × 100 what gives us 718700
+ 7187 × 2000 that is equal 14374000

= 15502359
