It depends which country you are referring to.
The only US President to never marry was James Buchanan.
The 15th president of United States, James Buchanan from 1857-1861, was the only president who never married. Resources: Wikipedia
It was not and never has been a requirement in the US.
James Buchanan was never married. Thomas Jefferson, Andrew Jackson, Martin Van Buren and Chester Alan Arthur were widowers and were unmarried while they were President.. Grover Cleveland was a bachelor when he took office, but married while he was President. John Tyler, Woodrow Wilson and Benjamin Harrison had their wives die while they were President and so were unmarried until they married again.
As of 2014 there has only been on President in the U.S. who was not married. This President was James Buchanan who was the 15th President.
No. There was one US president, James Buchanan, who never was married.
James Buchanan, who was the 15th president, is the only president that never got married. It is highly speculated that he was homosexual.
It is difficult to answer this question, since you do not tell us which president you are asking about. Most of the presidents of the United States were married (or had been married but were widowers). Only one never married-- James Buchanan.
Emily Dickinson never married .
Buchanan was engaged to Anne C. Coleman, of Lancaster , PA. She broke off the engagement and died not long afterward from a possible suicide. Her father would not let James attend her funeral.
He was the only US president who never married.
The only President who never married was James Buchanan. Thomas Jefferson, Andrew Jackson, Martin van Buren, and Chester A. Arthur were all widowers before taking office. Grover Cleveland was unmarried when he took office but then got married while President.