Alright, let's work through 8638 times 2623 step by step
8638 × 2623 = 2623 × (8638)
+ 2623 × 8 that is equal 20984
+ 2623 × 30 what gives us 78690
+ 2623 × 600 yielding 1573800
+ 2623 × 8000 producing 20984000

= 22657474
