Phpmyadmin is an easy tools to have visualize interface to access database.
If it is not in use, better to disable it to protect your site from hack or SQLInjection,
You do not want to remove it, because in future it might be needed again, so just disable it in a simple way and enable it again later without need of uninstall or reinstall.
How to disable phpmyadmin safely?
chmod 000 /var/www/html/phpmyadmin
How to enable it later?
chmod 755 /var/www/html/phpmyadmin