Q: Is 642,667 a Prime Number?
A: No, 642,667 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 642667 can be evenly divided by 1 137 4,691 and 642,667, with no remainder.
Since 642,667 cannot be divided by just 1 and 642,667, it is not a prime number.