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A monomial is a number, a variable or the product of a number and one or more variables with non-negative integer exponents. The monomial has only one term.

A polynomial is a monomial or the sum of monomials, each called a term of the polynomial.

The polynomial having only one term is called a monomial.

The polynomial having two terms is called a binomial. That is binomial is sum of two monomials.

The polynomial having three terms is called a trinomial. That is trinomial is sum of three monomials.

The given expression is$\frac{3x}{5y}$.

The given expression can be written as:

role="math" localid="1647713974168" $$\begin{gathered} \frac{3x}{5y}=\frac{3}{5}×\frac{x}{y} \\ =\frac{3}{5}×x×y^{−1} \\ =\frac{3}{5}x{y}^{−1} \end{gathered}$$

Therefore, the expression is $\frac{3}{5}x{y}^{−1}$.

It can be noticed that each term of the expression is the product of a number and variables with negative integer exponents.

Therefore, the term of the expression is not a monomial.

As, the expression is not a monomial. Therefore, the given expression is not a polynomial.