Q: Is 121,503 a Prime Number?
A: No, 121,503 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 121503 can be evenly divided by 1 3 101 303 401 1,203 40,501 and 121,503, with no remainder.
Since 121,503 cannot be divided by just 1 and 121,503, it is not a prime number.