Q: Is 641,320 a Prime Number?
A: No, 641,320 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 641320 can be evenly divided by 1 2 4 5 8 10 20 40 16,033 32,066 64,132 80,165 128,264 160,330 320,660 and 641,320, with no remainder.
Since 641,320 cannot be divided by just 1 and 641,320, it is not a prime number.