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Are all square numbers also composite numbers explain?
Every square number (except 1) is composite. Prime numbers only have two factors, one and the numbers themselves. Since square numbers also have at least the square roots as factors, they have to be composite.
Give two composite numbers that are also prime numbers?
Greater than one, numbers are either composite or prime, never both.
Is the product of two composite numbers also a composite number?
Yes, of course. In fact the product of any two numbers is composite unless one of them is 1.
What is the sum of the first four composite numbers?
You can figure out the "composite numbers" from any table of primes - all the positive integers that are not prime numbers are composite (the number one should also be excluded). The first four composite numbers are:4, 6, 8, 9
Are all numbers with a 0 in the ones place a composite numbers?
Yes. All numbers with 0 in the one's column are composite, having at least the factors of 1, 2, 5, and itself. The number 0 is also composite, having all numbers as factors.
