Alright, let's work through 3638 times 8391 step by step
3638 × 8391 = 8391 × (3638)
+ 8391 × 8 producing 67128
+ 8391 × 30 resulting in 251730
+ 8391 × 600 which equals 5034600
+ 8391 × 3000 which equals 25173000

= 30526458
