Q: Is 21,279 a Prime Number?
A: No, 21,279 is not a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 21279 can be evenly divided by 1 3 41 123 173 519 7,093 and 21,279, with no remainder.
Since 21,279 cannot be divided by just 1 and 21,279, it is not a prime number.