Q: Is 78,921 a Prime Number?
A: No, 78,921 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 78921 can be evenly divided by 1 3 9 27 37 79 111 237 333 711 999 2,133 2,923 8,769 26,307 and 78,921, with no remainder.
Since 78,921 cannot be divided by just 1 and 78,921, it is not a prime number.