Q: Is 21,013 a Prime Number?
A: Yes, 21,013 is a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 21013 can be evenly divided by 1 and 21,013, with no remainder.
Since 21,013 can be divided by just 1 and 21,013, it is a prime number.