Let $R$ be an integral domain and $a$ be a nonzero non unit of $R$. Recall that:

(i) $a$ is called irreducible if whenever $a=bc$ for some $b, c\in R$, then $b$ or $c$ is a unit.

(ii) $a$ is prime if whenever $a|bc$ for some $b, c\in R$, then $a|b$ or $a|c$.

Note that every prime element is irreducible.

Let $R=\mathbb{Q}[x^2,x^3]$.

Which of the following is true about $R$?

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