Use have_comments() function.
Example:
<?php if ( have_comments() ) : ?>
<h2 class="has-comments"><a href="https://wordpress.stackexchange.com/questions/363222/<?php the_permalink(); ?>"><?php the_title(); ?></a></h2>
<?php else : ?>
<h2><a href="https://wordpress.stackexchange.com/questions/363222/<?php the_permalink(); ?>"><?php the_title(); ?></a></h2>
<?php endif; ?>
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