Q: Is 678,125 a Prime Number?
A: No, 678,125 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 678125 can be evenly divided by 1 5 7 25 31 35 125 155 175 217 625 775 875 1,085 3,125 3,875 4,375 5,425 19,375 21,875 27,125 96,875 135,625 and 678,125, with no remainder.
Since 678,125 cannot be divided by just 1 and 678,125, it is not a prime number.