Q: Is 21,289 a Prime Number?
A: No, 21,289 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 21289 can be evenly divided by 1 61 349 and 21,289, with no remainder.
Since 21,289 cannot be divided by just 1 and 21,289, it is not a prime number.