A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.
http://wiki.answers.com/Q/Why_is_number_2_the_only...

2 is the only even prime number because all of the other even numbe...
http://www.chacha.com/question/whyis2theonlye...

Because a Prime number is only divisible by 1 and itself. 2 is low enough to qualify for that rule. All other even numbers are divisible by 2.
http://answers.yahoo.com/question/index?qid=201012...

1. Write the number in rows to make a grid, starting with one and ending with the upper limit. For example, to find prime numbers between 50 and 99, start with 1 and end with 99.
http://www.ehow.com/how_8385311_primenumberbetwe...
