Q: Is 642,609 a Prime Number?
A: No, 642,609 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 642609 can be evenly divided by 1 3 9 11 33 99 6,491 19,473 58,419 71,401 214,203 and 642,609, with no remainder.
Since 642,609 cannot be divided by just 1 and 642,609, it is not a prime number.