Alright, let's work through 6439 times 3425 step by step
6439 × 3425 = 3425 × (6439)
+ 3425 × 9 that is equal 30825
+ 3425 × 30 producing 102750
+ 3425 × 400 yielding 1370000
+ 3425 × 6000 resulting in 20550000

= 22053575
