Alright, let's work through 6899 times 3653 step by step
6899 × 3653 = 3653 × (6899)
+ 3653 × 9 which equals 32877
+ 3653 × 90 producing 328770
+ 3653 × 800 yielding 2922400
+ 3653 × 6000 giving us 21918000

= 25202047
