If a number cannot be factored it is a prime number.
All composite numbers can be expressed as unique products of prime numbers. This is known as a prime factorization.
-5 Is Not A Valid Number.
It is still called a polynomial.
because one number is being factored by the other number. and the numbers in a multiplication problem are just called factors anyway. hope this helped you.
No. It can be factored as 13*47.
Every nonzero whole number can be factored.