My son is my whole life and he is loved by many and can feel that love but my question is does a child have the right to know who their father is whether or not he is a good or bad person.
There's not enough information available about the person you suspect may be the father, nor about how likely you feel it is that this person is the father. Nor do we know anything about whether the man would even be willing to participate in the paternity test, or if you've discussed it with him at all.
Whether or not you try to get a DNA test is up to you, and any advice you get here will just be opinions. There's just not enough information to go by to even give you an informed opinion.
However, to address the question I quoted above, about whether a child has the right to know who their father is...
It's not a matter of the child's "right". Many children grow up never knowing who one or both of their parents are. Talking about it as his "right" is probably not the best way to look at the situation, especially since you don't even know (yet) if this person is the father. What if he isn't?
What matters is: will it be good for your son?
That's almost impossible to say, especially given that you don't know much about this guy, or how he'd react.
So instead, look at it the other way: will it be bad for your son if he doesn't know who his father is?
In my opinion, the answer is a qualified "no".
Sure, he'll wonder. He may even be sad about not knowing at some points in his life.
But the important thing is that he has people in his life who love him and support him. Knowing the name of the man who fathered him doesn't provide that.
For that matter, being the biological father doesn't equate to being an actual father.
Someone who is involved in his life, whether a grandparent, aunt or uncle, cousin, or even just a good friend of the family, who can be a supportive and nurturing resource is worth far, far more than whoever may have contributed some DNA if that person isn't involved in their life.
Realistically, if you don't have any expectation of rekindling a relationship (romantic or platonic), the biggest benefit to finding out who the father might be is for purposes of establishing a medical history of the family, so that doctors can help identify potential risk factors. Even that doesn't count as a benefit if you don't think you could have that dialog with the guy at some point.