What kind of number has only two factors: 1 and itself?

Prime

Who loses their shadow in the movie 'Peter Pan'? In "Home Alone", what is the name of the protagonist portrayed by Macaulay Culkin? In tennis, which term indicates zero points for both players at the beginning of the match? Who is the original performer of the hit song "If I Ain't Got You"? Who became the first President of Turkey in 1923?