Prove whether or not the relation is a partial order

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How I would go about proving that the below is or isn't a partial order:

consider the set $\ \mathbb{Z}\ $ of integers:

$aRb \ $ if $\ b = ra \ $ for some positive integer $r$

It adheres to the anti-symmetric property as:

$\ (a,b)\ and\ (b,a)\ \in R \iff r=1\ and\ b=a$

It adheres to the reflexive property as:

$\ (a,a)\ and\ (b,b)\ \in R \iff r=1\ and\ b=a$

Do these suffice as proofs