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# Why do you need to know all of the factors to a number to know if it is a prime or composite number?

Updated: 11/1/2022

Wiki User

10y ago

You don't.

If you know just one factor, other than 1 and the number itself, you will know that the number is composite.

A prime has only two factors: 1 and itself. So all the factors is no big deal.

Wiki User

10y ago

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Q: Why do you need to know all of the factors to a number to know if it is a prime or composite number?
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### How do you know when a number is prime composite or neither by looking at the factors of the number?

Prime numbers have two factors; composite numbers have more than two factors. 1 and 0 are neither.

### How can you know weather a number is prime or composite?

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

### 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 do you need to know about prime and composite numbers?

If you know a number is composite, then you also know that it can be factored into more factors than just 1 and itself. 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.

### How do you know when a number is composite or prime?

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

### Do you need to know all the factors of a number in order to determine if it is a prime or composite?

No. There are techniques to find if it is prime

### Why do you need to know all of the factors of a number in order to determine if its a prime or composite?

Prime numbers have just two factors, 1 and itself. Composite numbers have more than two factors.

### How do you know if a number is composite prime or neither by looking at the factors of the number explain your answer?

Prime numbers have two factors. Composite have more than two. Neither (one and zero) have less than two.

### How do you know 360 is composite or prime?

Because it is divisible by 10 with no remainder and it has more than two factors which makes it a composite number whereas a prime number has only two factors which are itself and one

### How can you know whether a number is prime or 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.

### How do people know if a number is prime or 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.

### Which is true about 143 It is a prime number It is a composite number It is a whole number that is neither prime nor composite or It is not a whole number?

We know that 143 is a whole number and that it has to be either prime or composite because all whole numbers other than 0 and 1 are one or the other. So, in order to determine if it is prime or composite, we need to know if any numbers besides 1 and 143 are factors. 1, 11, 13, and 143 are factors so 143 is a composite number.