No, you don’t require HTML for WordPress. If you need to build a website in WordPress you don’t need to learn HTML or any scripting language for that matter. In WordPress, you could build dynamic and functional websites without coding. WordPress is written in PHP and you don’t need to learn even PHP for building a website in WordPress.
If you wish to become a full-fledged web developer? Then I would recommend you to take up the Full-stack web development course from Intellipaat.
And watch our YouTube video on HTML vs WordPress to get a better insight.