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Because 1 is the only positive integer that divides evenly into 1 with no remainder.

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Q: Why 1 has only one factor?
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Related questions

What are the factors of -1?

One is the only factor of 1.1 has only one factor which is itself


What is the factor that has only one factor?

1


What is the number that has only on factor?

1 has one factor.


What is the only one factor?

1


What is a pair factor of 1?

One only has one factor. If you have to, you can use (1,1)


What is the common factor of 8 and 35?

It is 1 = one


What kind of numbers have one factor?

The only number with just one factor is 1.


What number has only one prime factor?

No prime number only has one factor. Each prime number has itself and 1 as factors. Now, the number 1 of course has only one factor, but it is technically not a prime number.


What whole number less than 100 has the least factors?

1 has 1 factor.


What if the common factor is 1?

If the common factor is only one, the fraction is in its simplest form.


What is the common factor of 7 and 36?

One (1), because 7 is a prime number, so the only one possible for their common factor is 1.


Why is the greatest common factor of 17 and 23 is 1?

17 and 23 are both prime. The only factors they have are one and themselves. Their only factor in common is 1 so it has to be the greatest common factor.