Proposition: Prop. 8.15: Number divides Number iff Cube divides Cube
(Proposition 15 from Book 8 of Euclid's “Elements”)
If a cube number measures a(nother) cube number then the side (of the former) will also measure the side (of the latter). And if the side (of a cube number) measures the side (of another cube number) then the (former) cube (number) will also measure the (latter) cube (number) .
 For let the cube number $A$ measure the cube (number) $B$, and let $C$ be the side of $A$, and $D$ (the side) of $B$.
 I say that $C$ measures $D$.
 And so let $C$ measure $D$.
 I say that $A$ will also measure $B$.
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References
Adapted from (subject to copyright, with kind permission)
 Fitzpatrick, Richard: Euclid's "Elements of Geometry"
Adapted from CC BYSA 3.0 Sources:
 Prime.mover and others: "Pr∞fWiki", https://proofwiki.org/wiki/Main_Page, 2016