121
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.
When the number is a square of a prime number. Of course, it will have a repeated factor, but it will still only have 3 distinct factors. 4, 9, 25, 49, 121 are some examples.
One is a perfect square that is a factor of 7.
Two is a prime number (and the only even prime number). Its only factors are 1 and itself.
17 If the number has only two factors, it must be a prime number. The only factors of 17 are 1 and 17. The difference between 1 and 17 is 16.
The numbers with only three factors are squares of prime numbers.
No, only square numbers have an odd number of factors.
196Its only factors (other than itself and 1) are 2, 7, and 14.
A square number
The square of any prime number has only three factors. Example: 121 is the square of 11, a prime number. The only factors of 121 are 1, 11, and 121 itself.
4,9,25. Any square with a prime number as its root.
Okay, whoever said that a number can only have an even number of factors IS Wrong Take a prime number and square it. If you square a prime number, the number you get will only have 3 factors. For example, if I squared the number 3, I would get 9. 9 only has three factors: 9, 3, 1 Any prime number squared has Three factors.
A number has exactly three factors if and only if it is the square of a prime number.
Factors can be listed as factor pairs. With square numbers, one of those pairs will be the same number twice. When written as a list, only one of them will be used, leaving an odd number of factors.
Factors come in pairs. It is only in the case of a square number that the two middle factors are equal and so are counted only once.
Yes.
The square of any prime number has exactly 3 factors. They are: 1). 1 2). the number itself 3). the prime number which is its square-root