If that $2400 was earnings on a W-2, you are not required to file, but if you had any income tax withheld in Box 2, you can get a refund of that, so you should file a return.
If the money was self-employment, you need to file a Schedule C with Form 1040. Or if you had Obamacare and received advanced payments, you are required to file a return.
Do I have to file a return this year? See the chart in this FAQ.
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