Q: Is 243,403 a Prime Number?
A: Yes, 243,403 is a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 243403 can be evenly divided by 1 and 243,403, with no remainder.
Since 243,403 can be divided by just 1 and 243,403, it is a prime number.