Why $\mathbb{Q}(\sqrt{\alpha})\neq \mathbb{Q}(\sqrt{\beta})$ if $\sqrt{\alpha \beta} \notin \mathbb{Q}$?

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I was wondering why if we take $\alpha, \beta \in \mathbb{Q}$ such that $\sqrt{\alpha \beta} \notin \mathbb{Q}$, then we have that the field extensions $\mathbb{Q}(\sqrt{\alpha})$ and $\mathbb{Q}(\sqrt{\beta})$ are not the same. And also, it is an iff statement? It is possible to generalise it?