Alright, let's work through 6621 times 3580 step by step
6621 × 3580 = 3580 × (6621)
+ 3580 × 1 that results in 3580
+ 3580 × 20 yielding 71600
+ 3580 × 600 that is equal 2148000
+ 3580 × 6000 that results in 21480000

= 23703180
