You don’t have to wonder; they will most definitely let you know.
You will receive an email notification (since your YouTube and Gmail accounts are essentially one and the same, you will receive it at your Gmail associated with that channel).
You will also be able to see ANY copyright notifications/claims and strikes in your Video Manager:
for more answers please refer below:
https://www.quora.com/How-do-I-know-if-my-video-on-YouTube-got-a-copyright-strike