In a word, Yes! But let’s be more clear. The content that H5P produces in web standard HTML5 (that’s 2/3 of the acronym), so it can be published via an iframe embed code in any web page or with any web tool that publishes HTML.
So first, I can use not here in discourse. This is one of the types of content H5P provides that you usually cannot do in say an LMS, the Agamotto. It allows you to create a series of images that can be explored via the slider at the bottom.
This one is meant to show a published H5P, how it appears in the editing interface, and how the .h5p file it publishes is truly a .zip that can be explored.
The same embed code is available.
And just for fun, I put one inside a web page from a site I built in the 1990s, amongst the big pile of content from my Maricopa years. Check this out!
https://mcli.cogdogblog.com/eye/h5p.html
WordPress is just one platform you can add H5P authoring capability to with a plugin (there are plugins for drupal, and LMS platforms like Canvas, moodle, etc).
And H5P content can be moved from one authoring platform to another. The source .h5p file can be downloaded via the Reuse button.
The H5P authoring interface is exactly the same in every platform. But you do not even need that to create H5P - -try the desktop editor from Lumi. You can create new content from scratch, or import existing .h5p files and make modifications.