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If you are talking about the number itself, they can be the same. To be specific: A prime number is a number that only has the factors 1 and itself. A factor is a number that when multiplied creates a product. A prime factor is a prime number that is multiplied to create a product.
The number one is only multiplied by itself.
No. A square number is the product of a number multiplied by itself. Nineteen is a prime number.
No, because a prime number is 1x a number, but it is not a number multiplied itself. The only way you can get 1 as a product is when you multiply 1x1.
18 is a composite number because a prime number can only be multiplied by 1 and itself. 18 can be multiplied by 9 and 2 also.