Alright, let's work through 6691 times 3561 step by step
6691 × 3561 = 3561 × (6691)
+ 3561 × 1 that equals 3561
+ 3561 × 90 that results in 320490
+ 3561 × 600 that results in 2136600
+ 3561 × 6000 that equals 21366000

= 23826651
