Any square of a Prime number. For example, 5*5 = 25 has the factors 1, 5, 25. If you square any other prime number, call it "p", the factors of the result are 1, p, p square.
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there are only 2 factors because 3 is a prime number: the factors are 1 and 3
3 is a prime number. It is only evenly divisible by itself and one.The factors of 9 are: 1, 3, and 9.The only prime factor of 9 is: 3.
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Squares of prime numbers are the only numbers with three factors, since there must be only one nontrivial divisor for a number to have three factors. That number must thus be prime.
A factor is a number that can evenly be divided into another number. Any number can be divided by one and itself. Numbers that can only be divided by one and themselves are called prime numbers. The number one and the number itself are factors of the number.Hence its factors are 1 and 3 itself.