Does the student have to increase CGPA to 6.5 or above 7 for better chances in Ireland for a Master's?

Yes, increasing your CGPA to at least 6.5 will significantly improve your chances for master's admission in Ireland. Most universities require a minimum CGPA of 6.0 - 6.5, and your current CGPA of 5.6 is below this range.

A higher CGPA will make you eligible for more programs and strengthen your application. Some universities may consider lower CGPAs if you have strong work experience or other achievements, but raising your CGPA is the most effective way to improve your prospects.