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Q: What numbers between 1and 20 only have 2 factors?

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Because the prime numbers between 1and 50 only have exactly 2 unique factors.

Only common is one only

All prime numbers have only two factors, one and themselves.

They are the numbers that have more than two factors whereas prime numbers have only two factors

They are the numbers that have more than two factors whereas prime numbers have only two factors

They are the numbers that have more than two factors in them whereas prime numbers have only two factors.

Only 1.

They are the composite numbers that have more than two factors in them whereas prime numbers have only two factors in them

They will be the numbers with more than two factors because prime numbers have only two factors

Prime numbers have only two factors.

They are all the prime numbers from 2 to 97 that have only two factors

Numbers having only 2 factors are prime numbers. Their only factors are 1 and themselves. Prime numbers. The only two factors should be 1 and itself.

Numbers that have only 2 factors are prime numbers

Because they are both prime numbers which means that they have only 2 factors

Prime numbers only have one and itself as factors.

In that range, only 100 has exactly 9 factors.

2,3,5,7,11,13,17 &19 - they're all the prime numbers !

Prime numbers have only two factors, 1 and themselves, so only prime numbers could have only two factors

All prime numbers have only two factors.

They are the numbers that have more than 2 factors in them because a prime number has only 2 factors which are itself and one

No because only prime numbers have 2 factors whereas composite numbers have more than 2 factors

No, only square numbers have an odd number of factors.

Prime numbers

Prime numbers.

Prime numbers.