No. 2 is even and cannot be written as a sum of 2 prime numbers.
For even numbers greater than 2, this is the Goldbach conjecture, one of the best known conjectures. It has been shown to hold true up to 4*10^18 but has not been proved.
Yes. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.
true
The Fundamental theorem of arithmetic.
5
The only prime number in the 90s is 97. So out of ten numbers one is a prime number and the remaining nine numbers are composite numbers. So 90s comprises of both prime numbers and composite numbers.
the prime factorization
No.
1 can't.
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.