You don't need any anti virus , uninstall it Delete apps on your iPhone, iPad, and iPod touch - Apple Support
If you shared your router password change it If you need help with your Wi‑Fi password - Apple Support
Forget the Wi-Fi network, then join it again
If your device previously joined the network, and now you want it to join with a different password, forget the Wi-Fi network:
How to forget a Wi-Fi network
Then then join the network again. When you rejoin the network, you will be asked to enter its current password.
Don't share your Apple ID and password Security and your Apple ID - Apple Support
Read this article Use the built-in privacy and security protections of iPhone - Apple Support
You can check the status of your account at this link https://iforgot.apple.com/appleid#!§ion=appleid
When your own correct account credentials are entered a green check mark will appear account verified ( use a web browser to use this link ) .