Q: Is 640,042 a Prime Number?
A: No, 640,042 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 640042 can be evenly divided by 1 2 13 26 103 206 239 478 1,339 2,678 3,107 6,214 24,617 49,234 320,021 and 640,042, with no remainder.
Since 640,042 cannot be divided by just 1 and 640,042, it is not a prime number.