Exponent is a number that tells how many times the base number is used as a factor. For example, 3² indicates that the base number 3 is used as a factor 2 times. To determine the value of 3², multiply 3*3 which would give the result 9.similary 4*4=16 ,6*6=36 that is 6²

Squares shows that it has value of two. . To find the area of a square or rectangular  , multiply width with length and in case of cube mutiply lenght by width by widht ,and also haing power of three as exponents for ex, 3³ 
Exponents are written as a superscript number (e.g. 3²) or preceded by the caret (^) symbol ,it can be seen in any calculator
Some facts about exponents:

1. Zero squared (e.g. 0² = 0)
2. seven squared (e.g. 7² = 49