Alright, let's work through 6394 times 2638 step by step
6394 × 2638 = 2638 × (6394)
+ 2638 × 4 which equals 10552
+ 2638 × 90 which equals 237420
+ 2638 × 300 producing 791400
+ 2638 × 6000 yielding 15828000

= 16867372
