Alright, let's work through 6690 times 2121 step by step
6690 × 2121 = 2121 × (6690)
+ 2121 × 0 producing 0
+ 2121 × 90 yielding 190890
+ 2121 × 600 what gives us 1272600
+ 2121 × 6000 giving us 12726000

= 14189490
