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Q: How can you tell without any calculations whether the number 5 is a prime or composite number?

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If it is 5 it is a prime. If it is any other positive integer ending in 5 it is a composite.

To prove whether a number is composite, factor it. A number having any factor besides 1 and itself is composite.

20 is a composite number

Now.... That depends on whether it is a number orr not!? :)

A composite number is an natural number that can be divided, without 27 29

A number can be factored to determine whether it is prime or composite. A prime number has exactly 2 factors, 1 and the number itself. A composite number has more than two factors.

factor

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.

However by looking at a number it is not easy to figure out whether a number is prime or composite. Every even number excpet 2 is a composite number so, any number having last digit as 0, 2, 4, 6 or 8 is a composite number. This is one of the ways to figure out. However for the odd numbers it becomes diificult to figure out. For a quicker analysis there are divisiblity rules. These are shorthand ways to find whether a number is divisble by another without performing actual division. Please take a look at the related links(below) for more information.

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35 is a composite number because it has more than two factors

Since 74 is an even number, it can be divided by 2 without getting a remainder. Therefore, it is a composite number.

If a number is divisible by anything other than itself and 1, it's composite.

A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.

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

You need at least two numbers to find an LCM. It doesn't matter whether they are prime or composite.

If it has more than two factors.

1. Is 10 a composite number?2. Is 3 a composite number?3. Is 17 a composite number?4. Is 24 a composite number?5. Is 31 a composite number?6. Is 38 a composite number?

A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.

None whatsoever. Whether or not a number is composite or prime, even or odd, is roughly analogous to whether a word is a noun or an adjective. They're just tools.

It is a composite number.284 is a composite number

94 is a composite number

It is a composite number.

It is a composite number.

Both. It is a number and it is composite.