Alright, let's work through 6690 times 9140 step by step
6690 × 9140 = 9140 × (6690)
+ 9140 × 0 yielding 0
+ 9140 × 90 producing 822600
+ 9140 × 600 that is equal 5484000
+ 9140 × 6000 resulting in 54840000

= 61146600
