To determine who can increase the number of Supreme Court judges:
1. Under Article 124(2) of the Indian Constitution, the number of judges in the Supreme Court can be increased by Parliament through legislation.
2. The President acts on the advice of the Parliament, the Prime Minister has no direct authority, and the Chief Justice recommends but does not decide.
3. Thus, Parliament holds the authority to amend the law.
Therefore, the correct answer is (2) Parliament by Law.