Do I need an antivirus for iPad

None required, none available.

I'm not aware of any viruses or malware for non-jailbroken iOS devices, and there aren't any proper anti-virus apps in the app store, so no, you don't

No:

1. There really isn't any antivirus app for iOS
2. Its unecessary. there are no know viruses for iOS in the wild and the sandboxed ecosystem makes getting any kind of virus installed close to impossible.