Q: Is 280,005 a Prime Number?
A: No, 280,005 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 280005 can be evenly divided by 1 3 5 11 15 33 55 165 1,697 5,091 8,485 18,667 25,455 56,001 93,335 and 280,005, with no remainder.
Since 280,005 cannot be divided by just 1 and 280,005, it is not a prime number.