Q: Is 321,609 a Prime Number?
A: No, 321,609 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 321609 can be evenly divided by 1 3 23 59 69 79 177 237 1,357 1,817 4,071 4,661 5,451 13,983 107,203 and 321,609, with no remainder.
Since 321,609 cannot be divided by just 1 and 321,609, it is not a prime number.