Q: Suspicious Pop up on iPad Air 2

Scam for sure.

If you were using Safari reset it this way:  Close Safari completely from the app switcher window by double clicking the Home button and swiping up the Safari preview pane until it disappears from the screen. Then go to Settings > Safari > Clear History and Website Data. Then hold down the Home and Wake/Sleep buttons at the same time for about 15 seconds until the Apple logo appears.

It's a scam.

Yes, it was a scam.

Identifying fraudulent "phishing" email

Beware of Browser Pop-Up Tech Support, Phishing Scams

Phishing & Other Suspicious Emails

iDevice Safari Phishing Adware Pop-ups

1. Kill Safari by double-tapping on the Home button. Locate Safari in the task bar, then slide the Safari mini-page upwards so it vanishes.
2. Tap Settings > Safari > Clear History and Website Data. Next, locate Security section and slide the “Block Pop-Ups” switch to the On position.
3. Press the Home button to return to your Home screen.
4. If this doesn’t help, then reset your device. It won't delete your data. Press and hold down the On/Off button and the Home button until the display turns off and returns with the Apple logo showing.
5. Alternatively, follow these instructions to reset your device: Restart your iPhone, iPad, or iPod touch - Apple Support.

My pleasure.