Only one - which is repeated.
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19 x 19 = 361
They are: 359+2 = 361
It is impossible to list all squared prime numbers as there is an infinite number of squared prime numbers starting with 4, 9, 25, 49, 121, 169, 289, 361, 529, 841,...
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.
No, its square of 19.