I found a pill that is white and round, kind of small and it says m2a4 and 57344 on it. What kind of pill is this?

Since this is a pill you have found, I just need to ask the following questions:
1. What is your age?
2. Where did you find this pill?
3. Why haven't you called a pharmacy or the emergency room of your local hospital and ask how to dispose of this pill?

I will give you the following website to look up this pill. Pill Identifier - Drugs.com (http://www.drugs.com/pill_identification.html)

My best advice is to call your local ER or a pharmacy and ask how to dispose of it properly.