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If you swipe,you only remove from recent apps,the app is still running in the background.
To stop apps running in background then please please download a third party app but that is not sugested here bcas it may use more ram but they work...
Taskillers are not a good idea
I think this article explains it pretty well: http://www.howtogeek.com/127388/htg-explains-why-you-shouldnt-use-a-task-killer-on-android
For memory management,you can use file commander,file manager HD etc.I do not suggest users to use task killers:
http://www.howtogeek.com/127388/htg-explains-why-you-shouldnt-use-a-task-killer-on-android/