Q: Is 644,629 a Prime Number?
A: Yes, 644,629 is a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 644629 can be evenly divided by 1 and 644,629, with no remainder.
Since 644,629 can be divided by just 1 and 644,629, it is a prime number.