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No, it's not reusable. Elon Musk was asked in October 2014 what his plans are for a reusable second stage (i.e., Dragon); you can watch his answer here: https://www.youtube.com/watch?v=PULkWGHeIQQ&t=419. Essentially: In many missions (i.e. from a geostationary orbit, 36,000 km from Earth), using the current technology, getting the upper stage back is "really difficult". But the next generation of (much bigger) rockets will be designed for full reusability, because those are the ones that will be going to Mars and back many times. He believes (at the time of the video, 2014) that testing of those could begin around 2019 or 2020. But watch his answer, it's only 2 minutes long. --Jhertel (talk) 12:25, 26 February 2017 (UTC)
"...reusable second stage (i.e. Dragon)" You are confusing Dragon (payload) and 2nd stage. Dragon capsule is designed for both reentry and reusability. They even designed the heatshield for multiple uses before replacement. Only the trunk and nosecone are expended. --IanOsgood (talk) 17:00, 26 February 2017 (UTC)
Thank you for correcting me! --Jhertel (talk) 17:45, 26 February 2017 (UTC)