Q: Is 561,537 a Prime Number?
A: No, 561,537 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 561537 can be evenly divided by 1 3 9 43 129 387 1,451 4,353 13,059 62,393 187,179 and 561,537, with no remainder.
Since 561,537 cannot be divided by just 1 and 561,537, it is not a prime number.