Alright, let's work through 1994 times 6397 step by step
1994 × 6397 = 6397 × (1994)
+ 6397 × 4 which equals 25588
+ 6397 × 90 yielding 575730
+ 6397 × 900 yielding 5757300
+ 6397 × 1000 producing 6397000

= 12755618
