It is because a whole number multiplied by itself does not equal 15.
An example of a square number is 49.
7 times 7 equals 49.
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225 is a square number.
The square root of 15 is not a whole number.
a square has a perimeter but a square isnt a perimeter. so no a square isnt a perimeter
15 is the square root of 225 (15 x 15 = 225).
The square root of 15 is an irrational number