2 is the only prime factor of 4.
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No prime numbers are only divisible by one and by themselves.
24 of them.
4 is not prime.
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,...
Any prime numbers: 3,5,7,11,13,17,19,etc.