We're going to solve 2191 multiplied by 9999
2191 × 9999 = 9999 × (2191)
+ 9999 × 1 producing 9999
+ 9999 × 90 producing 899910
+ 9999 × 100 resulting in 999900
+ 9999 × 2000 which equals 19998000

= 21907809
