It is a numerical constant.
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No. A polynomial can have as many degrees as you like.
A "root" of a polynomial is any value which, when replaced for the variable, results in the polynomial evaluating to zero. For example, in the polynomial x2 - 9, if you replace "x" by 3, or by -3, the resulting expression is equal to zero.
Since the question did not specify a rational polynomial, the answer is a polynomial of degree 3.
(x - 3)(x - 3)
6x+5b+3, see related link for a thorough explanation of what a polynomial is.