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Q: What do you call a number when it only has 1 factor?

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a prime number

Because a prime number has two factors whereas 1 has only one factor which is itself

1

It is 1 because it only has itself as a factor.

The number ' 1 ' has only one factor.

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a prime number

I call it 1.

The only number with one factor is 1.

Because a prime number has two factors whereas 1 has only one factor which is itself

One is the only number that is a factor of every other number.

All numbers, (except 1) have at least two factors: 1 and the number itself. So, there are no numbers, besides 1, with only 1 factor. And 1 is neither prime nor composite.

1

1 has one factor.

The only number with one factor is 1.

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.

1 because only 1 can go into it

It is 1 because it only has itself as a factor.