Let's calculate 6389 x 6446
6389 × 6446 = 6446 × (6389)
+ 6446 × 9 that equals 58014
+ 6446 × 80 that equals 515680
+ 6446 × 300 that results in 1933800
+ 6446 × 6000 which equals 38676000

= 41183494
