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No, it does not. Parentheses are used to include information that is not essential to the sentence. They can also be used to de-emphasize information. Of course, you can have complete sentences in parentheses, but it is not necessary.
Parentheses are the little "(" and ")" marks used to denote something said in an aside. You should enclose this phrase in parentheses.
Brackets tends to be an English expression, Parentheses is used in the USA and elsewhere. Technically, Parentheses are rounded brackets but this really doesn't matter in mathematics as long as different shaped brackets/parentheses are used to separate the various elements of a mathematical expression.
parentheses
It doesn't matter whether exponents are involved or not. Parentheses are used to specify that a certain calculation (the part within parentheses) is to be calculated before other things.