You have installed many different applications on your android gadget. Your only two worries are these: if your SD card is infected or not, and the application's security (specially if you haven't downloaded it from Google Play!)
You don't have to worry, because we will tell you what to do. Download and Install "CM Security". Open the application so you can start scanning all applications that have been installed on your gadget, and find out aboy the well-being of your SD card.
This is the first page of the applicaition. By clicking "scan", the process will start.
Of course, for scanning all software, you can schedule scans so the program will start scanning automatically anytime you want, or scan SD card or every application befire it gets installed.
In order to find out if your SD card is infected or not, you can click on the specified option shown below.