Q: Is 6,399 a Composite Number?
A: Yes, 6,399 is a composite number.
The number 6,399 can be evenly divided by 1 3 9 27 79 81 237 711 2,133 and 6,399, with no remainder.
Since 6,399 cannot be divided by just 1 and 6,399, it is a composite number.