To find if they are perfect squares, find the square root of each number, if it is a whole number ( no decimal) it is a perfect square, if it contains a decimal it is not.
25 : √25 = 5 YES
2
: √2 = 1.414 NO
81
: √81 = 9 YES
1
: √1 = 1 YES
5
: √5 = 2.23 NO
11
: √11 = 3.31 NO
144
: √144 = 12 YES
45
: √45 = 6.70 NO
400
: √400 = 20 YES
36
: √36 = 6 YES
225
: √225 = 15 YES
4
: √4 = 2 YES
9: √9 = 3 YES
