You can tell whether a number is a square number by looking at the last digit. A perfect square number ends with either 1, 4, 5, 6, 9 or 00.
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if it's square root is an integer, it is a square number.
If I tell you that the square root of 2 (for example) is such-and-such, you can verify this by multiplying the number by itself, and seeing whether the result is close to 2.
Try it out. Take the square root on a calculator, and see whether you get a whole number.
One quick way to tell whether or not a cell is dividing is to look at the number of chromosomes. If the number is doubled then it is dividing.
If it is even