Q: Is 640,577 a Prime Number?
A: No, 640,577 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 640577 can be evenly divided by 1 7 17 49 119 769 833 5,383 13,073 37,681 91,511 and 640,577, with no remainder.
Since 640,577 cannot be divided by just 1 and 640,577, it is not a prime number.