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There is no simple answer. You need to check for divisibility by every number from 2 up to its square root. There are some simple rules for checking for divisibility by small numbers. As soon as you have found one such factor you know that it is a composite number.
The fact that it is so difficult to tell is why composite numbers made up of two large primes are used for data encryption.
Wiki User
∙ 9y ago
Wiki User
∙ 8y agoIt has more than two factors.
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How do you know 120 is a composite number?
You know 120 is a composite number because it is an even number that is greater than 2.
How do you know it is a composite number?
A number is composite if it has more than two factors. Once you find a third, you know.
Is 649 prime or composite?
No it is a composite number if you want to know
How do you know 28 is composite number?
We know that 28 is a composite number because:It is an even numberIt is divisible by more than 2 numbers
Do you need to know all of the factors of number to know if it is prime or composite?
No, if a number has even one additional factor besides itself and the number one, then you automatically know it's composite.
How do you determine a composite number?
Composite numbers have more than two factors. Once you find a third factor, you know your number is composite.
Is 276 a prime or composite number?
Composite: i know it can at least be divided by 2 and 3
What is a composite number list 3 composite numbers?
dont know dont care
Do you need to know all of the factors of a number to know it is prime or composite?
To know that a number is prime you need to know that it has no factors other than 1 and the number itself.To know that a number is composite you only need to know one factor other than the number itself or 1.
Why is it important to know if a number is prime or composite?
A prime number can never be composite in any case. There is an exception for 2 which is both.
How would you know if 86 is composite?
The only even prime number is 2. Every other even number is composite.
Is 83 composite-?
For goodness sake! This will be on a test one day and you will not know it! But, the answer is no, it is prime
