Q: Is 640,625 a Prime Number?
A: No, 640,625 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 640625 can be evenly divided by 1 5 25 41 125 205 625 1,025 3,125 5,125 15,625 25,625 128,125 and 640,625, with no remainder.
Since 640,625 cannot be divided by just 1 and 640,625, it is not a prime number.