Q: Is 165,561 a Prime Number?
A: No, 165,561 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 165561 can be evenly divided by 1 3 11 29 33 87 173 319 519 957 1,903 5,017 5,709 15,051 55,187 and 165,561, with no remainder.
Since 165,561 cannot be divided by just 1 and 165,561, it is not a prime number.