Alright, let's work through 6381 times 6397 step by step
6381 × 6397 = 6397 × (6381)
+ 6397 × 1 that results in 6397
+ 6397 × 80 that results in 511760
+ 6397 × 300 that results in 1919100
+ 6397 × 6000 which equals 38382000

= 40819257
