Q: Is 561,618 a Prime Number?
A: No, 561,618 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 561618 can be evenly divided by 1 2 3 6 9 18 41 82 123 246 369 738 761 1,522 2,283 4,566 6,849 13,698 31,201 62,402 93,603 187,206 280,809 and 561,618, with no remainder.
Since 561,618 cannot be divided by just 1 and 561,618, it is not a prime number.