Q: Is 21,129 a Prime Number?
A: No, 21,129 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 21129 can be evenly divided by 1 3 7,043 and 21,129, with no remainder.
Since 21,129 cannot be divided by just 1 and 21,129, it is not a prime number.