Q: Is 231,561 a Prime Number?
A: No, 231,561 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 231561 can be evenly divided by 1 3 9 11 33 99 2,339 7,017 21,051 25,729 77,187 and 231,561, with no remainder.
Since 231,561 cannot be divided by just 1 and 231,561, it is not a prime number.