Q: Is 640,509 a Prime Number?
A: No, 640,509 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 640509 can be evenly divided by 1 3 17 19 51 57 323 661 969 1,983 11,237 12,559 33,711 37,677 213,503 and 640,509, with no remainder.
Since 640,509 cannot be divided by just 1 and 640,509, it is not a prime number.