The idea that some polynomials cannot be factored at all is compared to which fact about numbers?

1. Just as some numbers, like 7 or 13, have only themselves and 1 as factors, some polynomials have no factor pairs either. 2. Such numbers are called prime, and the source applies the same idea to polynomials that cannot be broken into a product of smaller polynomials. 3. A prime polynomial is not related to whether its coefficients are negative, even, or fractional; it is about having no valid factorization at all. _Source: OpenStax Elementary Algebra (CC BY 4.0), Ch 7 "Factoring", section 7.1 Greatest Common Factor and Factor by Grouping_