Q: Is 15,921 a Prime Number?
A: No, 15,921 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 15921 can be evenly divided by 1 3 9 29 61 87 183 261 549 1,769 5,307 and 15,921, with no remainder.
Since 15,921 cannot be divided by just 1 and 15,921, it is not a prime number.