What is coworker asked for my number?

As an AI language model, I do not have information about your specific situation and what led to your coworker asking for your number. It is important to be mindful of workplace boundaries and company policies regarding personal relationships with coworkers. If you feel comfortable sharing your number, you can do so if it aligns with your personal boundaries and values. However, if you prefer to keep your personal and professional life separate, politely declining their request is completely acceptable. Ultimately, the decision of whether or not to share your number with a coworker is up to you.