Answer:
The prime minister is a member of the Parliament or legislature in a parliamentary democracy while the President is not.
Step-by-step explanation:
A democratic government, is simple terms, is a representative government; that is, it is a government formed by the representatives of the people for the common good or well being of the people.
It could either be a Parliamentary democracy or a Presidential democracy.
In a parliamentary democracy, the Prime minister, is first and foremost an elected legislator who is a member of parliament.
To become the Prime minister, he must have the trust and confidence of his party which must have the highest number of elected legislators in the parliament.
Hence in a parliamentary democracy, a prime minister is the leader of the party that has the highest number of elected legislators in the parliament.
Nations with parliamentary democracies (for example the United Kingdom) usually have a Monarch as the Head of Government, while the Prime Minister. In parliamentary democracies, the legislature
In a Presidential democracy however, the Head of State or President is usually elected as part of the executive arm of government, which is often different from the legislative arm.
Hence the President in a Presidential democracy is not a member of the legislature while the prime minister is a member of the legislature in a parliamentary democracy.