# Gauss's lemma

> Condition under which a integer is a quadratic residue

**Wikidata**: [Q2526246](https://www.wikidata.org/wiki/Q2526246)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Gauss's_lemma_(number_theory))  
**Source**: https://4ort.xyz/entity/gauss-s-lemma-q2526246


## References

1. Freebase Data Dumps. 2013