What do the different numbers mean on say, a 7 band EQ. My car has those sliders and I'm wanting to get an EQ pedal. I just don't really understand what the numbers mean.
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It's basically a more in depth version of the standard Bass, Treble, Mid EQ on a guitar amp except is more in depth and more sensitive so you can better tweak it to suite your own style. I'm sure if you google it you can find an explanation.
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The numbers are the specific frequency you'll be cutting or boosting.

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Each of the sliders on an EQ effect a certain range of frequencies. This allows you to customize the sound you hear coming from your speakers to account for room acoustics. The room you have your stereo, or amp, in, may "color" the sound, causing certain frequencies to sound hotter or softer than they were meant. This is where the EQ comes in. Let's say you have a bare room with no wall or floor treatments and the highs are too hot. By cutting back on the upper frequencies of your EQ, you can compensate for room acoustics.

Does this help?
Additionally, the lower the band number, the less actual control you have over your sound. For example, a 7-band EQ will still cover 20 Hz to 20 KHz, but it has to do it with 7 sliders. A 31-band EQ gives more control, because the same 20 Hz to 20 KHz is broken up into more slices, as it were.