We're going to solve 1991 multiplied by 1593
1991 × 1593 = 1593 × (1991)
+ 1593 × 1 giving us 1593
+ 1593 × 90 producing 143370
+ 1593 × 900 that is equal 1433700
+ 1593 × 1000 producing 1593000

= 3171663
