Check for virus

There are no true Antivirus Products available for iOS/iPadOS. Those that claim to provide AV protection are little more than “snake oil”, have negligible (if any benefit) and for Apple devices should generally be avoided. Very often, Apps of this nature introduce more issues than added benefit.

Unlike traditional Operating Systems with which you may be familiar, iOS/iPadOS uses a sandboxed security architecture. As such, Apps cannot access any data outside of their own sandbox - and cannot access the storage and resources of other Apps. As such, it is impossible for an Anti-Virus App to scan the filesystem.

Providing your iPad has been kept up-to-date with system software updates, you should not be overly concerned for your iPad being directly compromised by malware.

For older devices, no longer benefiting from regular security updates, or those that are not kept up to date when system software updates are available, the risk of an unpatched vulnerability being exploited increases. 

You can't; Apple's sandboxing stops malware from affecting it, and also stops a scanner from checking anything other than its own documents.

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