# Is 18 a Prime Number or Composite Number

Created by: Team Maths - Examples.com, Last Updated: May 10, 2024

## Is 18 a Prime Number?

### No – 18 is not a prime number.

Why No: 18 is not a prime number because it does not meet the prime criteria of having exactly two distinct positive divisors: 1 and itself. Instead, 18 has divisors 1, 2, 3, 6, 9, and 18. Check Prime or Not

## Is 18 a Composite Number?

### YES – 18 is a Composite Number

Why Yes: 18 is a composite number because it has more than two distinct positive divisors: 1, 2, 3, 6, 9, and itself (18).

## Problem Statements

Property Answer
Is 18 a prime number? No
Is 18 a composite number? Yes
Is 18 a perfect square? No
Factors of 18 1, 2, 3, 6, 9, 18
Multiples of 18 18, 36, 54, 72, 90, 108, 126, 144, 162, 180
Cube Root of 18 Not a whole number
Square of 18 324
Square Root of 18  4.243
Is 18 a Perfect Square? No
Is 18 a Perfect Cube? No
Is 18 an Irrational number No
Is 18 a Rational number Yes
Is 18 a Real number Yes
Is 18 an Integer Yes
Is 18 a Natural number Yes
Is 18 a Whole number Yes
Is 18 an Even or odd number Yes (18 is an even number)
Is 18 an Ordinal number Yes
Is 18 a Complex number Yes (as all real numbers are also complex numbers)

## What are the Factors of 18?

The factors of 18 are 1, 2, 3, 6, 9, and 18. These are the numbers that divide 18 without leaving a remainder.

## What Kind of Number is 18?

• 18 is not a prime number, but a composite number.
• 18 is one of the even composite numbers.
• 18 is considered a symbol of completeness in various cultures.
• A natural number.
• A positive integer.
• A composite number.
• An even number.
• A rational number.
• A whole number.

18 is recognized not as a prime number but as a composite number because it has divisors other than 1 and itself, specifically 1, 2, 3, 6, 9, and 18. This distinguishes it from prime numbers, which have exactly two distinct positive divisors. The number 18, in particular, may carry its own significance in specific contexts, albeit its universal cultural symbolism may not be as prominent as some other numbers. Its status as a composite number emphasizes the varied nature of numerical properties and their influence on both mathematics and cultural beliefs.

## Prime Factors of 18?

The prime factors of 18 are 2 and 3. This is because 18 can be factored into 2 x 9, and 9 can be further factored into 3 x 3. Therefore, the prime factorization of 18 is 2 x 3 x 3.

## Is 18 a perfect square?

No, 18 is not a perfect square. A perfect square is a number that can be expressed as the square of an integer, and there is no integer whose square equals 18.

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