No, unless this was self-employment income where the filing threshold is $400, you do not need to file a tax return.
The 2018 filing threshold is $10,400 for single filers and higher if married.
Yes, you should. I would use Free File Edition so you don't pay anything for filing. Follow this link: <a rel="nofollow" target="_blank" href="http://turbotax.intuit.com/taxfreedom/">http://turbotax.intuit.com/taxfreedom/</a>.