Q: Is 665,240 a Prime Number?
A: No, 665,240 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 665240 can be evenly divided by 1 2 4 5 8 10 20 40 16,631 33,262 66,524 83,155 133,048 166,310 332,620 and 665,240, with no remainder.
Since 665,240 cannot be divided by just 1 and 665,240, it is not a prime number.