Alright, let's work through 6477 times 3931 step by step
6477 × 3931 = 3931 × (6477)
+ 3931 × 7 resulting in 27517
+ 3931 × 70 giving us 275170
+ 3931 × 400 yielding 1572400
+ 3931 × 6000 resulting in 23586000

= 25461087
