Q: Can every number be written as the sum of 2 prime numbers?

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Yes, by definition!

No.

The premise of your questions is false: NOT every number is a prime number.

No. It IS true that every whole number is either prime or composite. But there are numbers that are not whole numbers, such as 2.5, which are neither prime nor composite.

But you do know the factors of prime numbers. Every prime number has two factors: one and the number itself.

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the prime factorization

No.

Yes, by definition!

Yes. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.

Every composite number ... that is, one that is not a prime ... can be written as the product of two or more prime numbers. The primes themselves are the exceptions. A prime number is the product of only ' 1 ' and itself, and ' 1 ' is not considered a prime number.

true

Those are composite numbers.

No.

The premise of your questions is false: NOT every number is a prime number.

There is only one square number from 5-15: 9. This can be written as the sum of 2 and 7, which are prime numbers.

The Fundamental theorem of arithmetic.

No. It IS true that every whole number is either prime or composite. But there are numbers that are not whole numbers, such as 2.5, which are neither prime nor composite.