It could be 1/3 when expressed as a decimal is 0.333333 ..... recurring
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Any such number has a perfect square factor.If you want examples, just multiply some prime factors together, making sure that at least one is repeated.
A prime number has only one prime factor, and that prime factor is the number itself.
By definition, all prime numbers have exactly two factors. There is not a prime number that has only one factor.
a prime factor
No 1 it is not a prime number. The definition of a prime number is that it can only have factors of one and itself. Since one already has one then it can not be a prime number.