25 of them.
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A [perfect] square number, by definition, has a factor which is its square root. As a result it CANNOT be a prime!
Numbers with more than two factors are not prime numbers
A prime number can't be divided, then it's not a square
A square number, by definition, cannot be a prime so the answer is there are no such numbers.A square number, by definition, cannot be a prime so the answer is there are no such numbers.A square number, by definition, cannot be a prime so the answer is there are no such numbers.A square number, by definition, cannot be a prime so the answer is there are no such numbers.
There are 25 prime numbers between 1 and 100.