Alright, let's work through 3863 times 6623 step by step
3863 × 6623 = 6623 × (3863)
+ 6623 × 3 what gives us 19869
+ 6623 × 60 giving us 397380
+ 6623 × 800 what gives us 5298400
+ 6623 × 3000 what gives us 19869000

= 25584649
