28 and 32
Two is prime. All other even numbers are composite.
Composite numbers have more than two factors. Once you find a third factor, you know your number is composite.
Only two: (4, 9) and (6, 6). In all other factor pairs, one of the numbers is not composite.
Factor them. Prime numbers have two factors, composite numbers have more than two.
28 and 32
8 and 16, among others.
Composite numbers have more than two factors. So, the numbers which have two or less than two factors are not composite numbers. Numbers which have exactly two factors are prime numbers. 1 is an exceptional case because it is neither prime nor composite since it has only one factor which is 1.
Prime numbers have two factors, composite numbers have more than two.
Composite numbers have more than two factors.
Two is prime. All other even numbers are composite.
8 and 16
25 and 36
Composite numbers have more than two factors. Once you find a third factor, you know your number is composite.
A composite number is the product of two or more prime numbers. A prime number has exactly two factors, 1 and the number itself; a composite number has at least one more factor than the two that a prime number has.
39 is a composite number because it has more than two factors, and 1 is not a composite number because it has just one factor.
Prime numbers have two and only two factors. Composite numbers have three or more.