About: http://webisa.webdatacommons.org/3612361

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	As you mentioned, for 2, the sum of its factors is odd, and it is not a perfect square.So, if a number is a perfect square, then the sum of its factors is necessarily odd, but the reciprocal is not true.
http://www.w3.org/ns/prov#wasQuotedFrom	gmatclub.com