Alright, let's work through 8365 times 638 step by step
8365 × 638 = 638 × (8365)
+ 638 × 5 that results in 3190
+ 638 × 60 that results in 38280
+ 638 × 300 that is equal 191400
+ 638 × 8000 yielding 5104000

= 5336870
