Let's calculate 1638 x 2568
1638 × 2568 = 2568 × (1638)
+ 2568 × 8 that results in 20544
+ 2568 × 30 that results in 77040
+ 2568 × 600 producing 1540800
+ 2568 × 1000 what gives us 2568000

= 4206384
