Q: Is 6,400,664 a Prime Number?
A: No, 6,400,664 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 6400664 can be evenly divided by 1 2 4 8 800,083 1,600,166 3,200,332 and 6,400,664, with no remainder.
Since 6,400,664 cannot be divided by just 1 and 6,400,664, it is not a prime number.