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.
7
21 is not a prime number. It is divisible by 3 and 7, in addition to 1 and itself.
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.
number 21 is 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
It is not possible for any multiple of a prime number to be prime.
Yes. 25 is a multiple of 5 and the number 5 is a prime number.
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.