Alright, let's work through 6391 times 2075 step by step
6391 × 2075 = 2075 × (6391)
+ 2075 × 1 resulting in 2075
+ 2075 × 90 that results in 186750
+ 2075 × 300 what gives us 622500
+ 2075 × 6000 resulting in 12450000

= 13261325
