Q: Is 640,742 a Prime Number?
A: No, 640,742 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 640742 can be evenly divided by 1 2 229 458 1,399 2,798 320,371 and 640,742, with no remainder.
Since 640,742 cannot be divided by just 1 and 640,742, it is not a prime number.