Q: Is 561,661 a Prime Number?
A: No, 561,661 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 561661 can be evenly divided by 1 67 83 101 5,561 6,767 8,383 and 561,661, with no remainder.
Since 561,661 cannot be divided by just 1 and 561,661, it is not a prime number.