Hide prev/next links for categories with only 1 post?

On my single post template, I’ve used the following:


<div>
<div class="alignleft"><?php previous_post('« %','','yes','yes') ?></div>
<div class="alignright"><?php next_post(' % »','','yes','yes') ?></div>
</div>


to include Previous/Next links at the top of a post linking to other posts in the same category.

Is there an “if” statement I can use so that these lines do not appear in a category with only one post?

Thanks!