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# What is a distinct number?

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In math, the term distinct number is used to refer to a number in a set that is not equal to another number. For example, the set of numbers {1, 2} contains the two distinct numbers 1 and 2, which can be proven by evaluating different traits of each number.

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The term distinct number may also be used in relation to functions. For example, the equation 4 = x^2 has two distinct values for x, as both -2^2 and 2^2 equal 4. A function that crosses the x-axis twice has two distinct numbers for the x-intercept. A quadratic function with complex numbers has two distinct number solutions, while a quadratic equation without complex numbers has only one distinct number for a solution.

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Friendly numbers are individual numbers that make up part of what is known as a friendly pair. Friendly numbers always come in sets of two, and they are known for having a positive density.

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The number one is neither prime nor composite. Prime numbers are those defined as natural numbers greater than one not divisible by any other numbers but one and itself. Composite numbers have at least one additional positive divisor and include all whole numbers greater than one that are not prime.

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In math, zero is considered to be an even number. In order to be even, a number must be able to be divided exactly by two. Zero qualifies because zero divided by two equals zero.

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