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Q: How can you tell if a number is a composite number?

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If a number has more than two factors, it's composite.

You cannot. If a number is even - other than 2 - then it is a composite number. However, if it is odd, it is not easily possible to tell whether it is prime or composite.

it is a composite number because you can tell from the 8 that it is an even number, and even numbers can always be divided.

A good way to instantly tell if a number is prime or composite is to learn some tricks to tell if a number divides by certain numbers. For instance, if a number is even, we know it is composite as it must be divisible by 2. If a number ends in 0 or 5, then it also cannot be prime as it would be divisible by 5. In this case, the number ends in 5, so we can tell it must be composite and cannot be prime.

Prime numbers have two factors. Composite numbers have more than two.

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If a number has more than two factors, it's composite.

It is even and therefore composite.

You cannot. If a number is even - other than 2 - then it is a composite number. However, if it is odd, it is not easily possible to tell whether it is prime or composite.

It is a composite number because it's an even number and it has more than two factors

it is a composite number because you can tell from the 8 that it is an even number, and even numbers can always be divided.

A number is composite if it has more than two factors. Once you find a third, you're done.

It has more than two factors.

you cant

A good way to instantly tell if a number is prime or composite is to learn some tricks to tell if a number divides by certain numbers. For instance, if a number is even, we know it is composite as it must be divisible by 2. If a number ends in 0 or 5, then it also cannot be prime as it would be divisible by 5. In this case, the number ends in 5, so we can tell it must be composite and cannot be prime.

Prime numbers have two factors. Composite numbers have more than two.

30 50 70 because they both end in 0 and 10 is a composite number

Any number that only has one and itself as factors is prime. Therefore, to tell if a number is prime simply find it's factors. If it has more than two factors than it is not a prime number, otherwise it is composite.

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