Q: Is 15,978 a Prime Number?
A: No, 15,978 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 15978 can be evenly divided by 1 2 3 6 2,663 5,326 7,989 and 15,978, with no remainder.
Since 15,978 cannot be divided by just 1 and 15,978, it is not a prime number.