Or just go "hey webhost support! do I have imagemagick?" that also works, but yea the phpinfo in a php file you can just load up. For example yourdomain.com/phpinfo.php
ImageMagick tools such as convert, mongrify and ImageMagick PHP are 2 different things. To check if ImageMagick tools have been installed you need to check the following, or The output would be something similar, If you want to see whether PHP has been built with ImageMagick i.e MagickWand which is ImageMagick API for PHP, you need to create and check the phpinfo() page.