Q: Is 21,609 a Composite Number?
A: Yes, 21,609 is a composite number.
The number 21,609 can be evenly divided by 1 3 7 9 21 49 63 147 343 441 1,029 2,401 3,087 7,203 and 21,609, with no remainder.
Since 21,609 cannot be divided by just 1 and 21,609, it is a composite number.