Q: Is 640,784 a Prime Number?
A: No, 640,784 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 640784 can be evenly divided by 1 2 4 8 16 29 58 116 232 464 1,381 2,762 5,524 11,048 22,096 40,049 80,098 160,196 320,392 and 640,784, with no remainder.
Since 640,784 cannot be divided by just 1 and 640,784, it is not a prime number.