Q: Is 21,315 a Composite Number?
A: Yes, 21,315 is a composite number.
The number 21,315 can be evenly divided by 1 3 5 7 15 21 29 35 49 87 105 145 147 203 245 435 609 735 1,015 1,421 3,045 4,263 7,105 and 21,315, with no remainder.
Since 21,315 cannot be divided by just 1 and 21,315, it is a composite number.