Alright, let's work through 6438 times 2773 step by step
6438 × 2773 = 2773 × (6438)
+ 2773 × 8 that is equal 22184
+ 2773 × 30 producing 83190
+ 2773 × 400 producing 1109200
+ 2773 × 6000 giving us 16638000

= 17852574
