89, 91 etc.
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13,17,19,23,29,31,37 thats it.
A prime number is a number thats only factors are 1 and itself. So find the factors of 2. They are 1, and 2. So 2 is prime. A composite number is a number that has more than a pair of factors. So find the factors of 8. They are 1, and 8. They are 2, and 4. 8 has more than 1 pair of factors. So it is composite
Seven is prime because the only factor for seven is one and itself ,so thats wat makes it prime.
THATS SOOO EASY!!!! there 17, 19, 23, 27, 29, 31, 37, use your brain! :)
theres only one even prime number, thats 2 prime numbers can only be divided by themselves, and 1 21, divisible by 3 or 7, so no 28 even number other than 2, so no 15, divisible by 3 or 5, so no 17 divisible only by itself and 1, so yes 28, even number, other than 2, so no