Q: Is 661,684 a Prime Number?
A: No, 661,684 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 661684 can be evenly divided by 1 2 4 43 86 172 3,847 7,694 15,388 165,421 330,842 and 661,684, with no remainder.
Since 661,684 cannot be divided by just 1 and 661,684, it is not a prime number.