Q: Virus is detected in my iphone6. How to protect the same.

Why don't you first describe what you have? Is this an email message or a Safari pop-up? If it is:

These are phishing scams. Do not click on any of the links nor call any telephone numbers.

Identifying fraudulent "phishing" email

Beware of Browser Pop-Up Tech Support, Phishing Scams

Phishing & Other Suspicious Emails

Report phishing email to abuse@apple.com.

iDevice Safari Phishing Adware Pop-ups

Your device does not have a virus. You can fix this as follows:

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.

Tap Settings > Safari > Clear History and Website Data. Next, locate Security section and slide the “Block Pop-Ups” switch to the On position.

Press the Home button to return to your Home screen.

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.

Alternatively, follow these instructions to reset your device: Restart your iPhone, iPad, or iPod touch - Apple Support.