Alright, let's work through 6431 times 3957 step by step
6431 × 3957 = 3957 × (6431)
+ 3957 × 1 yielding 3957
+ 3957 × 30 yielding 118710
+ 3957 × 400 resulting in 1582800
+ 3957 × 6000 yielding 23742000

= 25447467
