"You were hacked / 39 viruses" iPhone pop up

Your phone is not infected. You were wise to check it out but it was a scam. Just delete it and any further that appear but you may have downloaded something from a dodgy site. Be careful.

Aside from the Scam add you just got there is currently no malware for a non jailbroken iOS device

if you think your Apple ID has been compromised see this article:

https://support.apple.com/en-us/HT204145

You may wish to change your Apple ID log/pass with a password you do not use for any other on line service. If you use your same log/pass combo with another service (e.g. Yahoo, Twitter, Facebook, etc.) and that service is "hacked" then the perpetrators have to only try typing this same combo in any other service to get into your other accounts.

Change your Apple ID password - Apple Support

https://support.apple.com/en-ca/KM205079

Change the Email associated with the ID if you wish to remove the email in use:

https://support.apple.com/en-us/HT202667

Also consider enabling two factor authentication if you have not done so already.

Availability of two-factor authentication for Apple ID - Apple Support

See this link regarding you security questions.

https://support.apple.com/en-us/HT201363

Everyone says to just clear safari's history but that does not seem to solve the problem

then stop going to whatever site is telling your phone is infected.

bro mine said it has 7 virus bt these are advertisements from anti virus apps spam

Go to settings, Safari, clear history and website data and that'll make the pop up go away.

I had the same pop up virus message on my iPhone 7. To get rid of it, I just uninstalled Google and then reinstalled it from the AppStore.