Q: Is 642,821 a Prime Number?
A: No, 642,821 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 642821 can be evenly divided by 1 17 37,813 and 642,821, with no remainder.
Since 642,821 cannot be divided by just 1 and 642,821, it is not a prime number.