I thought it came built it. I did the process to go do my first scan but i cant find it. I have boost mobile, could that be the reason?
Better safe than sorry!
...in terms of malware protection you're probably already protected by Google — or just by common sense. Don't click on suspect links in unsolicited emails or text messages. Don't install an app that mysteriously downloaded itself to your phone or tablet. Only use reputable app stores like Google Play or the Amazon Appstore.
So do you need extra protection against viruses and malware? Probably not. Will it hurt anything if you choose to use an app? It'll take up space on your phone, perhaps. Maybe even rob your device of some performance. (And do know that there are a number of disreputable developers out there who sell nothing more than a placebo effect.)