Q: Is 10,521 a Prime Number?
A: No, 10,521 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 10521 can be evenly divided by 1 3 7 9 21 63 167 501 1,169 1,503 3,507 and 10,521, with no remainder.
Since 10,521 cannot be divided by just 1 and 10,521, it is not a prime number.