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.
There were 435 members in the US House of Representatives in 2007. The number was officially established by Congress with the Reapportionment Act of 1929.