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You try finding a factor. If there is no proper factor, then it is a prime.

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Q: How do you know if an expression is prime?
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Related questions

Why is 3x-1 prime?

We do not know if 3x - 1 is prime because we do not know what x is equal to here.


Is 4x2 9 prime?

4x^2 + 9 is a prime algebraic expression. Its numerical value may be prime of not - depending on the value of x.For x = 1, the value of the expression is 13 - a prime whereasfor x = 2, the value of the expression is 25 - not a prime.


What is first Mersenne prime number?

According to Mersenne 2n - 1 is a prime number(where n is also a prime number).As we all know the first prime number is 2 so putting the value of 2 in Mersenne's expression we get 22 - 1 = 3. So, 3 is the first Mersenne prime.Mersenne expression was considered as a method of finding primes. But it didn't always give prime number. Let us consider an example:Putting n = 11 in the expression we get 211 - 1 = 2047, but 2047 is not a prime number.Visit the below related link to know more.


What is an expression called that cannot be factored?

If an expression does not have a common factor, then it is called a "prime" expression.


What is an expression that shows the product of all of the numbers prime factors?

Prime factorisation.


What expression shows the product of all of a number's prime factors?

Prime factorization


What is an expression shows the product of all of numbers prime factors?

a prime factorization


What is called the group of expression that product of the common prime factors?

the prime factorization


When is an expression factored completely?

When the expression is broken down into its prime factors it is factored completely.


When a number is expressed as a product of factors that are all prime the expression is called?

Prime factorization.


What is the definishion of prime factorization?

The expression of a given composite number as the product of prime numbers.


What is the expression of a composite number as a product of a prime number?

That's known as the prime factorization.