Because the Google Play store is a stock application that comes packaged in the Android operating system, it can only be removed by first unlocking the phone. Unlocking, which is also called rooting in Android phones and jailbreaking in Apple phones, makes the operating system files available to delete and also voids the phone warranty.
Less permanent alternatives to rooting and deleting are hiding and disabling the app. To hide Google Play Store from the phone's home screen, enter the App Drawer and tap the Hide Applications button. Select the applications to hide by tapping the app icons on the home screen. To disable Google Play store, find it under the All Apps tab in Application Manager and tap both the Disable and Force Stop buttons. While this does not permanently delete Google Play store from the phone, it stops the app from running automatically.