Alright, let's work through 8187 times 2636 step by step
8187 × 2636 = 2636 × (8187)
+ 2636 × 7 which equals 18452
+ 2636 × 80 yielding 210880
+ 2636 × 100 yielding 263600
+ 2636 × 8000 that equals 21088000

= 21580932
