Source: wikibot/powerful-number
= Powerful number
{wiki=Powerful_number}
A **powerful number** is a positive integer \\( n \\) such that for every prime \\( p \\) that divides \\( n \\), \\( p^2 \\) also divides \\( n \\). In other words, if a prime number appears in the factorization of a powerful number, it must appear with an exponent of at least 2.