Alright, let's work through 6690 times 1853 step by step
6690 × 1853 = 1853 × (6690)
+ 1853 × 0 that equals 0
+ 1853 × 90 that results in 166770
+ 1853 × 600 giving us 1111800
+ 1853 × 6000 yielding 11118000

= 12396570
