Q: Is 21,138 a Composite Number?
A: Yes, 21,138 is a composite number.
The number 21,138 can be evenly divided by 1 2 3 6 13 26 39 78 271 542 813 1,626 3,523 7,046 10,569 and 21,138, with no remainder.
Since 21,138 cannot be divided by just 1 and 21,138, it is a composite number.