18 square is 324
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5607 + 18 = 5625, a perfect square. The perfect square of a square root is the number you started with.
It is 2 times 18 = 36 which is a perfect square number because 6 time 6 = 36
It is: 81
The square root of 648 is 18 times the square root of 2. 648 has no perfect square root.
false!