Virus notice on my ipad

On iOS and iPadOS, that's usually a junk pop-up, a sketchy page, or a hosed ad network.

It's also possible for a VPN client add-on or an ad-blocking app to cause problems, so check if you have one of those installed.

Also disable pop-ups. Settings > Safari > Block Pop-ups enabled

On iOS and iPadOS, push notifications are associated with specific apps, so those aren't arising from a web site. From an app, though?

And there are folks that will send bogus messages, and bogus texts.

To flush out any existing dreck in Safari, force-exit Safari, and then clear out all saved web site data. That's located under the Settings > Safari > Advanced setting.

Might want to check your home page and your search engine setting, but that's probably not been changed here.

Anti-malware on iOS and iPadOS can't rummage around outside its own sandbox without breaking security and violating the iOS and iPadOS app store rules, though it wouldn't surprise to find some of these tools are using the iOS VPN interface to sniff network traffic.

Any emails or browser pop-ups, claiming they are from Apple, are SPAM. Apple will never contact you regarding viruses or malware. NEVER respond to these prompts.

It may be possible that even though your Mac may not have a virus, it could be "infected" by adware/malware. At this point I would suggest that you get Malwarebytes for Mac to both detect and remove any potential malware that may be residing on your Mac.

Ref:

• Phishing & Other Suspicious Emails - Apple Support
• Identify legitimate emails from the App Store or iTunes Store - Apple Support
• Avoid phishing emails, fake 'virus' alerts, phony support calls, and other scams - Apple Support

Unless you've jailbroken your iPad, it's just short of impossible for it to be infected by anything.

Any and all web sites or popups claiming your device is infected with something is a lie. Period. It's literally impossible to tell what's on a remote computer through a web browser.