How many prime numbers are squares?

Date: 01/09/97 at 21:22:58
From: Anonymous
Subject: Prime

Dear Dr. Math,

How many prime numbers are squares?

Eric

Date: 01/10/97 at 13:19:08
From: Doctor Wilkinson
Subject: Re: Prime

None.  A prime number is a whole number other than 1 that is not a 
product of smaller numbers.  A square, on the other hand, is always 
the product of a smaller number by itself, except for 1, which we 
don't count as a prime. 

For example:

 4 = 2 * 2
 9 = 3 * 3

-Doctor Wilkinson,  The Math Forum
 Check out our web site!  http://mathforum.org/dr.math/