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A number with only one factor pair is........ a prime number for example 11 the only factor pair is one times 11.

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Q: A number with only one pair of factors?
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Which number out of these has only one pair of factors 12 15 17 or 21?

17


What are the factors on 17 in pairs?

The factor pair of 17 is 1*17. Because 17 is prime, it has only one factor pair.


Is the factors of 11 and 12 a pair of 137?

No because 137 is a prime number whose only factors are itself and one


Which only had one pair of factors 7 8 9?

It is 7 because it is a prime number


What are the factor and pair of the number 191?

191 is prime. It has one pair of factors, one and itself.


You are a product you have two factors One of your factors is the last year of the twentieth century your other factor is half of a pair What are you?

I am a prime number. My only factors are 1 and 1999!


What kind of number has more than one pair of factors?

A composite number.


What are the factors and prime factors of 103?

103 is a prime number. The only two factors of a prime number are 1 and itself. The only factor pair of 103 is 1 x 103. There is only one factor pair of a prime number. The proper factors of 103 are only 1 or, if the definition you are using excludes 1, there are none. The only prime factor of 103 is 103. There is only one prime factor of a prime number - itself. The distinct prime factor (listing each prime factor only once) of 103 is also 103.


Why 81 have an odd number of factors and 40 have an even number of factors?

A number will have an odd number of factors if and only if one of those factors is the square root of the number. This is because any factor of a number you can find must pair up with another factor of that number, and multiply to give the number. The only exception is when the factor would be paired with itself. In other words, be the square root. 81 is a square number, and so the factor 9 (square root of 81) will not pair with any other factor, meaning 81 will have an odd number of factors. 40 has an even number of factors, because it is not a square number, and so all its factors can pair up.


Why does 64 have an odd number of factors?

Because it is a square and the factor pair of 8 and 8 is only listed as one factor.


What is the name of a number that only has one pair of factors?

A prime number,for example: 2, 3, 5, 7, 11, 13, 17, 19 and so on.


What times what is 17?

Since 17 is a prime number, there is only one pair of distinct positive integer factors of the number:17 x 1 = 17