Hey there,
You won't need virus scanning apps because the iPhone doesn't get any viruses, as SravanKra told you unless you jailbreak your device!
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to make sure that your device isn’t jailbreaks :
One way to confirm if your iPhone is jailbroken is to look for an app called either “Cydia” or “Sileo”. These apps are in fact third-party app stores that are usually installed during the jailbreak process. However, it is also important to note that on a jailbroken device, any app icon (e.g. Cydia/Sileo) can be made invisible to the user so it is not a fool-proof method of detection.
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It is also important to check for any other unusual apps that have appeared on your home screen that you haven’t downloaded yourself. Many jailbreak tools include a launcher app which can be run to re-jailbreak the device if the jailbreak has been removed. An example of one of these apps is “checkra1n” which is often installed alongside one of the most popular jailbreaks. If you find an app that you’re not sure about, you should try Googling its name and it should tell you if it’s related to a jailbreak tool.