Alright, let's work through 6397 times 278 step by step
6397 × 278 = 278 × (6397)
+ 278 × 7 what gives us 1946
+ 278 × 90 resulting in 25020
+ 278 × 300 giving us 83400
+ 278 × 6000 that is equal 1668000

= 1778366
