Q: Is 621,509 a Prime Number?
A: No, 621,509 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 621509 can be evenly divided by 1 7 19 133 4,673 32,711 88,787 and 621,509, with no remainder.
Since 621,509 cannot be divided by just 1 and 621,509, it is not a prime number.