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This is a GMAT Shots blog, aimed at providing GMAT aspirants with concise, useful information that’ll help with their GMAT Preparation. This blog deals with ‘What are Prime numbers, and how to determine if a number is prime?’
Be sure to check out our other posts in the GMAT Shots Series.
A Prime number put simply, is a positive integer that can only be divided by 1 and itself. A prime number has no other factors or divisors.
One important note – Prime numbers are a subset of natural numbers. So, when determining if a number is prime, we only talk about positive integers.
There’s a simple 4-step method to determine if a given number ‘n’ is prime.
If any one of the listed primes divides our number ‘n’, then you know that ‘n’ is not a prime number.
Let’s take an example – the number 41.
Because 41 is not divisible by any of the prime numbers listed in step 3, we can conclude that 41 is a prime number.
Let’s take another example – the number 39.
Because 39 is divisible by one of the prime numbers listed in step 3, we can conclude that 39 is not a prime number.
This was originally a GMAT Shots video on our YouTube channel.
You can watch it there or through the embedded section below.
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