Check the battery voltage with the engine off. It must be over 12Volts. If it's under 12V, you need to charge it or purchase a new one if it's over 5 years old.
Sounds like a dead battery. Should have the battery and charging system checked. First you could try to clean the battery connections and make sure they are tight.
Sure sounds like a battery, I would try to charge it first. If you get it started go to Auto Zone if you have one near and have them test the battery and alternator...
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