To prevent apps from starting automatically on your device, you can stop or disable apps. 
You can also uninstall downloaded apps.

	In the main menu, select the menu item <Settings>.
	Select the menu item <Apps>.
	Select the app that should not be started automatically.
	Select <disable> or <force stop> (the app is disabled or stopped). Select <uninstall> (the app is uninstalled).

If you want to prevent apps from starting automatically on multiple devices, use a mobile device management tool (MDM tool).

Would you like to learn more about MDM tools? MDM on Wikipedia