Yes, dear Gray Lady, you certainly sound more sophisticated when you use the word "prime number" in your newspaper. But perhaps you might want to look up the actual meaning of the word before placing those words prominently beside two times five times five.
Come on, Dave, no love in your heart for the ancient art of headline puns?
I love headline puns. Compare, however this attempt, with nearly anything in the Economist :)
Few word have only one meaning in every context.