Q: Is 561,503 a Prime Number?
A: No, 561,503 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 561503 can be evenly divided by 1 31 59 307 1,829 9,517 18,113 and 561,503, with no remainder.
Since 561,503 cannot be divided by just 1 and 561,503, it is not a prime number.