Alright, let's work through 6403 times 622 step by step
6403 × 622 = 622 × (6403)
+ 622 × 3 that equals 1866
+ 622 × 00 which equals 0
+ 622 × 400 that is equal 248800
+ 622 × 6000 what gives us 3732000

= 3982666
