There are 25 prime numbers between 1 and 100, all of them can be factors.
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The Prime Factors of 45 are 3, 5
Once all the prime factors of a number have been found, the number of factors the number has and what they are can be found. I'd be finding the prime factors first before finding all the factors of a number, so I'd rather find all the prime factors as it means I can stop before I have to do more work in finding all the factors.
All numbers have factors. Some factors are prime numbers. These are known as prime factors. The set of prime factors is a subset of the set of factors for any given number.
All prime numbers have two factors.
Yes, 12 has prime factors. The prime factors of 12 are 2, 2, and 3, so the distinct prime factors are 2 and 3. Almost all integers have prime factors. The integers without prime factors are -1, 0, and 1.