Calendar notifications about virus & hackers

I am being sent a notification about viruses on my Calendar app on my iPhone. It says that I should download a app to fix it, but it seems off from what I have been reading about this. I need specific details about this though... these notifications are what has been being sent to me a lot. The things I read say it is a scam, but I want to make sure that it really is from a person who experienced the same thing or at least knows more about this. At one point I was being sent notifications to download a app for virus protection. Later I got a notification saying it will expose all my data to people in a time limit. I think this is scare ware... Not very sure but I mostly think it is...