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well first off all even numbers are composite (except 2).

you can fist off tell if a number can be divided by three by adding up its digits

such as 423. We know that 3 can go into this because the digits add up to 423.

please take third grade again to learn the rest of the rueles

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โˆ™ 2010-09-29 02:35:12
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โˆ™ 2012-02-26 19:40:22

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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Q: How can you tell if a number is a prime or composite number?
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It is even and therefore composite.


Can you tell a prime or composite number by seeing if its odd or even?

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.


How do you check if a number is prime or a composite number?

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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.


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