Welcome to Android Central! Did you install it yourself, or did it come preinstalled? If it's preinstalled, then you probably can't uninstall it, because it's bloatware.
If you did install it yourself, then go to Settings>Device Administrators and see if it's listed there. If so, make sure it's unchecked, then try uninstalling it again from either the Settings>Apps menu or the app page in the Google Play Store app.