No, not every number in the eighties is composite. A composite number is a positive integer greater than one that has more than two distinct positive divisors. In the eighties, the numbers 81 and 85 are composite because they have divisors other than 1 and themselves. However, the number 83 is prime because it only has two divisors, 1 and 83.
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Well, honey, let me break it down for you. A composite number is any number greater than 1 that can be divided by more than just 1 and itself. So, when we talk about the numbers in the 80s, not all of them are composite. For example, 81 is a composite number because it can be divided by 3 and 27, but 83 is a Prime number because it can only be divided by 1 and 83. So, not every number in the 80s is composite, but some are.
No
No, 97 is a prime number.
42 is a composite number; its factors are 1, 2, 3, 6, 7, 14, 21, 42. Every even number (except 2 itself) is composite.42 is a Composite Number.
Yes.
97 is the only prime number.
The answer is 'no', so there isn't any 'why'. As a matter of fact, every EVEN number except 2 is composite, and every prime number bigger than 2 is odd..