To determine all the factors of 81, start with 1 and write out all the factor pairs: 1x81=81. 3x27=81. 9x9=81. Then, start with 1 and list the factors. The factors of 81 are 1, 3,
http://wiki.answers.com/Q/What_are_the_factors_of_...

A square root is a number that can be multiplied by two other numbers that are the same. The square root of 81 is 9. The square root of 2 is 1.4142135624.
http://www.ask.com/webanswers/Reference/Other/wha...

Well I guess that would be 3^4 or 3*3*3*3
http://www.chacha.com/question/whatistheprimef...

9.
http://wiki.answers.com/Q/What_is_the_greatest_com...
