Polygonal numbers: These are numbers that can be represented as dots that are arranged in the shape of a regular polygon, including Triangular numbers, Square numbers, Pentagonal numbers, Hexagonal numbers, Heptagonal numbers, Octagonal numbers, Nonagonal numbers, Decagonal numbers, Hendecagonal numbers, and Dodecagonal numbers.Every integer greater than one is either prime or composite. Composite number: A positive integer that can be factored into a product of smaller positive integers.Prime number: A positive integer with exactly two positive divisors: itself and 1.Even and odd numbers: An integer is even if it is a multiple of 2, and is odd otherwise.Thus a non-positive number is either zero or negative. Non-positive numbers: Real numbers that are less than or equal to zero. Thus a non-negative number is either zero or positive. Non-negative numbers: Real numbers that are greater than or equal to zero.When zero is a possibility, the following terms are often used: Because zero itself has no sign, neither the positive numbers nor the negative numbers include zero.
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