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.
21 is composite number that is a multiple of 3. 31 is a prime number.
If 21 is a multiple of the number, the number cannot have 90 as a factor.
21 = 3x7, and so is not prime, as it can be expressed as the product of multiple prime numbers
number 21 is prime
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.
21 is a composite number, not a prime, having prime factors 3x7.
There is not a multiple of 7 that is prime.
number is both a prime number and a multiple of 5 = 5
Yes. 25 is a multiple of 5 and the number 5 is a prime number.
It is not possible for any multiple of a prime number to be prime.
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.