503, 509, 521, 523, 541, 547, 557 . . .
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500 is not a prime number. Other than 2, if a number is even, it is not prime since it is divisible by 2.
500 is a composite number
YES, 511 is the first prime number above 500.
503.
You can't simplify that. The only prime factors in 500 are 2 and 5 - and neither of them is a prime factor of 361.