Alright, let's work through 6413 times 4039 step by step
6413 × 4039 = 4039 × (6413)
+ 4039 × 3 yielding 12117
+ 4039 × 10 what gives us 40390
+ 4039 × 400 that equals 1615600
+ 4039 × 6000 what gives us 24234000

= 25902107
