How can I uninstall android apps that have been installed straight from apk files? Yandex store shows uninstall button only for those apps that are installed from the store. Can I just remove some files and what files might them be?

EDIT: For example if I want to uninstall WhatsApp, can I just remove desktop entry from /usr/share/applications/, apk from /data/app/ and icon from /var/lib/apkd? Is there something more that should be removed also?