What type of number has no factors other than 1 and itself?

More Questions:

Which US city is home to the Second City Comedy Troupe?

What sport is likely to cause pudendal nerve entrapment?

Which Bohemian city gave us the Pilsner?

What place did Dante describe as having "Abandon hope, all ye who enter here" written over its doors?

The seismic belt called the Ring of Fire surrounds what body of water?

The geothermal spa "Blue Lagoon" is located in what country?

What separates the twin cities of Minneapolis and Saint Paul?

Mogadishu is the capital of which African country?

What abbreviation comes from libra, meaning pound in Latin?

How many colors are there in the spectrum?

Who played Willy Wonka in the original version of "Willy Wonka and the Chocolate Factory"?

What TV title character lived at 485 Mapleton Drive, Mayfield?

In 1969, what woman said "No woman, in my time, will ever be Prime Minister"?

In what decade was Prince Charles born?

What Country music singer had a #1 single with "You Look Like I Need A Drink"?