Alright, let's work through 3639 times 6222 step by step
3639 × 6222 = 6222 × (3639)
+ 6222 × 9 that equals 55998
+ 6222 × 30 producing 186660
+ 6222 × 600 that equals 3733200
+ 6222 × 3000 giving us 18666000

= 22641858
