Prime Factors of 18

Steps to find Prime Factors of 18 by Division Method

To find the primefactors of 18 using the division method, follow these steps:

• Step 1. Start dividing 18 by the smallest prime number, i.e., 2, 3, 5, and so on. Find the smallest prime factor of the number.
• Step 2. After finding the smallest prime factor of the number 18, which is 2. Divide 18 by 2 to obtain the quotient (9).
  18 ÷ 2 = 9
• Step 3. Repeat step 1 with the obtained quotient (9).
  9 ÷ 3 = 3
  3 ÷ 3 = 1

So, the prime factorization of 18 is, 18 = 2 x 3 x 3.

Steps to find Prime Factors of 18 by Factor Tree Method

We can follow the same procedure using the factor tree of 18 as shown below:

So, the prime factorization of 18 is, 18 = 2 x 3 x 3.

What does Prime factor in mathematics mean?

Prime numbers, in mathematics are all those whole numbers greater than 1 having exactly two divisors that is 1 and the number itself. When we express any number as the product of these prime numbers than these prime numbers become prime factors of that number. Eg- Prime Factors of 18 are 2 x 3 x 3.

Properties of Prime Factors

• Two prime factors of a given number are always coprime to each other.
• 2 is the only even prime factor any number can have.
• Two prime factors are always coprime to each other.
• 1 is neither a prime number nor a composite number and also 1 is the factor of every given number. So, 1 is the factor of 18 but not a prime factor of 18.

Frequently Asked Questions

• Is 18 a prime number?

  false, 18 is not a prime number.

• How to find prime factorization of 18 easily?

  To find prime factorization of 18 easily you can refer to the steps given on this page step by step.

• Which is the largest prime factors of 18?

  The largest prime factor of 18 is 3.

• What is the sum of all prime factors of 18?

  Prime factors of 18 are 2 x 3 x 3. Therefore, their sum is 8.

• What is the product of all prime factors of 18?

  Prime factors of 18 are 2 x 3 x 3. Therefore, their product is 18.

• What numbers are the prime factors of 18?

  Prime factors of 18 are 2 , 3 , 3.

• What is the sum of all odd prime factors of 18?

  Prime factors of 18 are 2 , 3 , 3, out of which 3 , 3 are odd numbers. So, the sum of odd prime factors of 18 is 3 + 3 = 6.

• Is there any even prime factor of 18?

  Yes there is a even prime factor of 18.

• What is the product of all odd prime factors of 18?

  Prime factors of 18 are 2 , 3 , 3, out of which 3 , 3 are odd numbers. So, the product of odd prime factors of 18 is 3 x 3 = 9.