Let's calculate 9991 x 6377
9991 × 6377 = 6377 × (9991)
+ 6377 × 1 that results in 6377
+ 6377 × 90 that results in 573930
+ 6377 × 900 that equals 5739300
+ 6377 × 9000 what gives us 57393000

= 63712607
