Q: Is 561,143 a Prime Number?
A: No, 561,143 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 561143 can be evenly divided by 1 11 139 367 1,529 4,037 51,013 and 561,143, with no remainder.
Since 561,143 cannot be divided by just 1 and 561,143, it is not a prime number.