Assertion: prime number's factor | /r/HasProperty | proper
Facets:
value: because 1
type: CAUSE
value: because 2
type: CAUSE
value: because 3=6
type: CAUSE
Source sentences:
text: Any prime number is deficient, because it has only one proper factor: 1.
text: 6 (proper factors: 1,2,3) is a Perfect number because 1+2+3=6.