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# What is a positive integer?

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A positive integer is a number greater than zero that can be expressed without using a fraction. Five, 72 and 100,000 are all examples of positive integers.

## Keep Learning

Positive integers are sometimes called "counting numbers" because they are the numbers that most people use when they first learn how to count: one, two, three, etc. "Natural numbers" or "whole numbers" refers to all of the positive integers and also zero. Negative integers are numbers that can be expressed without using a fraction but that have a value of less than zero, such as -1. Zero is an integer, but is considered neither positive nor negative.

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## Related Questions

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The number 16 is an even number and is the only integer that has the form xy=yx, where x and y are different numbers (2 and 4). Another fact is that the base 16, or hexadecimal system, is a notational system for expressing real numbers used in computer science. The 16 digits it uses to represent numbers are the numbers 0-9 and the letters A-F.

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According to MathGoodies.com, zero is a neutral number or integer since it is neither negative nor positive. Whole numbers to the right of zero, or greater than zero, are known as positive integers. Whole numbers to the left of zero, or less than zero, are known as negative integers.

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A prime number in math is an integer greater than 1 that is evenly divisible by only 1 and the number itself. One is not considered a prime number, because prime numbers by definition have two factors, and the number 1 only has one factor: 1.