There are no prime numbers that are square numbers
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Any even exponent of 3 is a square number.
The square of any odd number is also an odd number for reasons that should be obvious.
Any odd number multiply with itself, or any other odd number results in odd square number.
Half of all square numbers are odd. They are the ones which are the square of an odd number.
no, every number is a real number --- There are numbers that are not real numbers. They are called imaginary numbers, and have the property that when they are squared, the result is negative. The square root of -1 is called i, and the square root of any other negative number is i times the square root of the absolute value of the number. So the square root of -4 is 2i.