PolynomialQ
PolynomialQ[expr,var]
yields True if expr is a polynomial in var, and yields False otherwise.
PolynomialQ[expr,{var1,…}]
tests whether expr is a polynomial in the vari.
Examples
Wolfram Research (1988), PolynomialQ, Wolfram Language function, https://reference.wolfram.com/language/ref/PolynomialQ.html.
Text
Wolfram Research (1988), PolynomialQ, Wolfram Language function, https://reference.wolfram.com/language/ref/PolynomialQ.html.
CMS
Wolfram Language. 1988. "PolynomialQ." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/PolynomialQ.html.
APA
Wolfram Language. (1988). PolynomialQ. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/PolynomialQ.html