Not an issue if you don't have full or shared custody. Of course it is going to come up in conversation. But don't lead with it.
If you fathered a child who lives full time with the mother, and it is a first date you could say "no" and be mostly honest. But if you take time out of your life to be a father, then this woman needs to know that. The same as whether you have a job, a car, and a place to live.
You could say "Thousands. I was a sperm donor" and move on....