check for malware

Essentially, you can’t - but this shouldn’t be a cause for concern.

Providing that you have not attempted to jailbreak your device - or have bypassed protections by side-loading third-Apps (if you don’t know what this is, then don’t worry about it), then it is highly unlikely that your device will have been infected with a virus or other malware.

The “closed” Apple iOS ecosystem and App Store are designed to protect your device from infected Apps. Your device generally cannot be infected/modified by infected code. You should however take care to avoid “phishing” or other types of attack that is designed to lure you into giving-away personal or other sensitive data.

Not jailbroken? Running the current iPadOS release? Haven’t exposed your Apple ID password? Not a target of a well-funded adversary such as an investigative journalist, political dissident, politician, or other high-value target? You’re good.