We're going to solve 1621 multiplied by 1309
1621 × 1309 = 1309 × (1621)
+ 1309 × 1 that is equal 1309
+ 1309 × 20 which equals 26180
+ 1309 × 600 that equals 785400
+ 1309 × 1000 resulting in 1309000

= 2121889
