Q: Is 21,389 a Prime Number?
A: No, 21,389 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 21389 can be evenly divided by 1 73 293 and 21,389, with no remainder.
Since 21,389 cannot be divided by just 1 and 21,389, it is not a prime number.