Using Outlook for Android in business environments for email and scheduling
Dear PC240957
Thanks for using Microsoft products and posting in the community.
Phones generally don't get viruses unless you're browsing websites you shouldn't be browsing, and phones generally have antivirus software these days, so you can try searching for it inside the app. I don't recommend restoring factory settings, we have found that many users restore factory settings without backing up their phone authenticator resulting in a lot of subsequent problems.
I hope the above information can help you.
Looking forward to your reply.
Best wishes
Clark | Microsoft Community Support Specialist