Alright, let's work through 3606 times 6643 step by step
3606 × 6643 = 6643 × (3606)
+ 6643 × 6 that equals 39858
+ 6643 × 00 that equals 0
+ 6643 × 600 resulting in 3985800
+ 6643 × 3000 resulting in 19929000

= 23954658
