Q: Is 21,310 a Prime Number?
A: No, 21,310 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 21310 can be evenly divided by 1 2 5 10 2,131 4,262 10,655 and 21,310, with no remainder.
Since 21,310 cannot be divided by just 1 and 21,310, it is not a prime number.