Q: Is 640,003 a Prime Number?
A: No, 640,003 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 640003 can be evenly divided by 1 7 13 91 169 541 1,183 3,787 7,033 49,231 91,429 and 640,003, with no remainder.
Since 640,003 cannot be divided by just 1 and 640,003, it is not a prime number.