Source: wikibot/congruence-of-squares
= Congruence of squares
{wiki=Congruence_of_squares}
Congruence of squares is a concept in number theory that deals with whether two numbers can be expressed as squares mod some integer. Specifically, it investigates under what conditions a quadratic residue (a number that is congruent to a perfect square modulo \\( n \\)) can be expressed as the square of another number modulo \\( n \\).