# What is the Greatest Common Factor (GCF) of 2 and 1938?

Are you on the hunt for the GCF of 2 and 1938? Since you're on this page I'd guess so! In this quick guide, we'll walk you through how to calculate the greatest common factor for any numbers you need to check. Let's jump in!

First off, if you're in a rush, here's the answer to the question "what is the GCF of 2 and 1938?":

GCF of 2 and 1938 = 2

## What is the Greatest Common Factor?

Put simply, the GCF of a set of whole numbers is the largest positive integer (i.e whole number and not a decimal) that divides evenly into all of the numbers in the set. It's also commonly known as:

• Greatest Common Denominator (GCD)
• Highest Common Factor (HCF)
• Greatest Common Divisor (GCD)

There are a number of different ways to calculate the GCF of a set of numbers depending how many numbers you have and how large they are.

For most school problems or uses, you can look at the factors of the numbers and find the greatest common factor that way. For 2 and 1938 those factors look like this:

• Factors for 2: 1 and 2
• Factors for 1938: 1, 2, 3, 6, 17, 19, 34, 38, 51, 57, 102, 114, 323, 646, 969, and 1938

As you can see when you list out the factors of each number, 2 is the greatest number that 2 and 1938 divides into.

## Prime Factors

As the numbers get larger, or you want to compare multiple numbers at the same time to find the GCF, you can see how listing out all of the factors would become too much. To fix this, you can use prime factors.

List out all of the prime factors for each number:

• Prime Factors for 2: 2
• Prime Factors for 1938: 2, 3, 17, and 19

Now that we have the list of prime factors, we need to find any which are common for each number.

In this case, there is only one common prime factor, 2. Since there are no others, the greatest common factor is this prime factor:

GCF = 2

## Find the GCF Using Euclid's Algorithm

The final method for calculating the GCF of 2 and 1938 is to use Euclid's algorithm. This is a more complicated way of calculating the greatest common factor and is really only used by GCD calculators.