Q: Is 21,353 a Prime Number?
A: No, 21,353 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 21353 can be evenly divided by 1 131 163 and 21,353, with no remainder.
Since 21,353 cannot be divided by just 1 and 21,353, it is not a prime number.