Q: Is 21,831 a Prime Number?
A: No, 21,831 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 21831 can be evenly divided by 1 3 19 57 383 1,149 7,277 and 21,831, with no remainder.
Since 21,831 cannot be divided by just 1 and 21,831, it is not a prime number.