In a parliamentary system, by contrast, the legislature holds supreme power. The prime minister is chosen by members of the legislature (Parliament) from among their own number and in practice is the leader of the majority party in the legislature.
There are 435 Representatives in the House of Representatives. The number of members in the House of Representatives is a different story and is based on population.
Congress has two parts, the Senate and the House of Representatives. There are 100 Senators, two from each state. The House of Representatives has 435 members. The number of Representatives each state gets is based on the state's population. States with large populations have more representatives.