Alright, let's work through 6387 times 3289 step by step
6387 × 3289 = 3289 × (6387)
+ 3289 × 7 that is equal 23023
+ 3289 × 80 that equals 263120
+ 3289 × 300 which equals 986700
+ 3289 × 6000 that equals 19734000

= 21006843
