Q: Is 643,204 a Prime Number?
A: No, 643,204 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 643204 can be evenly divided by 1 2 4 401 802 1,604 160,801 321,602 and 643,204, with no remainder.
Since 643,204 cannot be divided by just 1 and 643,204, it is not a prime number.