Yes, they are.
Yes except 7 itself which is a prime number
Yes that is correct
No, you can easily see that this is an even number, so it is a multiple of 2.2 IS A PRIME NUMBER!!Any number that is a multiple of a prime number is NOT a prime.
No... Every whole number that ends with a 5 includes 5 as a factor (is a multiple of 5).
No. Let p1 be a prime number. Let p2 be a multiple of p1 such that p2 = p1 * k. Then the factors of p2 are: 1, p1, k and p2. ==> p2 is not a prime number. Hence, a multiple of a prime number cannot be a prime number.
no
Because if they were even they would be a multiple of 2 and thus not prime.
No, it is not possible. Every multiple of 21 is a composite number. 21 is a composite number and its factors are 1, 3, 7 and 21(4 factors). Any multiple of 21 must have all the factors of 21. So, every multiple of 21 has at least 4 factors. And a prime number has only two factors so, any multiple of 21 can't be prime.
Yes except 7 itself which is a prime number
Yes that is correct
Every 9-digit combination of those numbers is a multiple of 3. None of them will be prime.
Not all (5 is prime) but every multiple of 5 greater than 5 is composite because they have more than two factors. Every multiple of any integer greater than one is composite.
No, you can easily see that this is an even number, so it is a multiple of 2.2 IS A PRIME NUMBER!!Any number that is a multiple of a prime number is NOT a prime.
No... Every whole number that ends with a 5 includes 5 as a factor (is a multiple of 5).
No, not every two-digit multiple of six is next to a prime number. A multiple of six will always be an even number, divisible by both 2 and 3. Prime numbers, on the other hand, are only divisible by 1 and themselves. Therefore, there will be even numbers that are multiples of six that are not next to prime numbers.
number is both a prime number and a multiple of 5 = 5
It is not possible for any multiple of a prime number to be prime.