Q: Is 321,978 a Prime Number?
A: No, 321,978 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 321978 can be evenly divided by 1 2 3 6 103 206 309 521 618 1,042 1,563 3,126 53,663 107,326 160,989 and 321,978, with no remainder.
Since 321,978 cannot be divided by just 1 and 321,978, it is not a prime number.