Currently i have these lines in functions.php and my home page respectively:

add_theme_support( 'post-thumbnails' );
add_image_size( 'square', 252, 252, true );

//

if ( has_post_thumbnail()):
      the_post_thumbnail( 'square' );
    endif; 

Then regenerate thumbnails plugin resizes images to 252 x 252.

How do I display cropped thumbnail images and not featured?