Alright, let's work through 3944 times 6413 step by step
3944 × 6413 = 6413 × (3944)
+ 6413 × 4 producing 25652
+ 6413 × 40 what gives us 256520
+ 6413 × 900 giving us 5771700
+ 6413 × 3000 producing 19239000

= 25292872
