It is a real number that can be expressed as a ratio of two integers.
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The mathematical term 'perfect square' means that a number, which has a rational number as its square root. 25 is a perfect square, because its square root is 5, a rational number.
In mathematical terms, a number x is less than y if y - x is positive.
A number that can be expressed as a ratio of two integers, X/Y where Y is not zero.
A rational number is one that has an ending.
In the strictest mathematical terminology, "How many ..." means: "If you count them, what will be the last number you mention ?" .