Q: Is 155,221 a Prime Number?
A: No, 155,221 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 155221 can be evenly divided by 1 11 103 137 1,133 1,507 14,111 and 155,221, with no remainder.
Since 155,221 cannot be divided by just 1 and 155,221, it is not a prime number.