Q: Is 20,503 a Prime Number?
A: No, 20,503 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 20503 can be evenly divided by 1 7 29 101 203 707 2,929 and 20,503, with no remainder.
Since 20,503 cannot be divided by just 1 and 20,503, it is not a prime number.