Q: Is 660,561 a Prime Number?
A: No, 660,561 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 660561 can be evenly divided by 1 3 11 33 37 111 407 541 1,221 1,623 5,951 17,853 20,017 60,051 220,187 and 660,561, with no remainder.
Since 660,561 cannot be divided by just 1 and 660,561, it is not a prime number.