No its not it's just spam, that happens when you click some links. Just close out that tab and keep moving ️.
This looks like a pop up ad in Safari. I would almost bet if you clicked on it, that it would ask you to pay for an app to clear your phone of the viruses or ask you to contact someone at a phone number to give you help to clear it.
My suggestion is to go into Settings>Safari>Clear History and Website Data. Click on it and clear the history. This should stop the pop up.
That is if it came from Safari. Hope this helps. Also make sure the phone is fully updated to the most recent IOS. Thanks.