There are many different numbers that are square numbers. A square number is defined as the number you get when you multiply an integer by itself. For example 4 x 4 equals 16 so 16 is the square number.
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All square numbers have an odd number of factors.
Half of all square numbers are odd. They are the ones which are the square of an odd number.
No, 55 is not a square number. Square numbers are numbers like this: 16, 25, 36 and 100 and heaps of others.
Square numbers
Square numbers have an odd number of factors.