I'd say no with a caveat. Security to protect against malware has been proven to be relatively ineffective in proof of concept applications. In the wild, unless you are installing apps from questionable sites, there isn't much (if any) to speak of. However, security to track and remotely wipe your phone if lost or stolen can be useful.
Read the links karandpr graciously provided and you should be okay.
I don't have the link on hand but someone here posted a series of YouTube videos that tested the various security apps and it showed that they do actually catch malware. However, it's very difficult to get infected if you're careful.
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