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 = 3x7, and so is not prime, as it can be expressed as the product of multiple prime numbers
number 21 is prime
21 is a composite number, not a prime, having prime factors 3x7.
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 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.
11 is a prime number but 21 is not a prime number as it is divisible by 3.
Yes. 25 is a multiple of 5 and the number 5 is a prime number.
To find the least common multiple (LCM) of 9, 21, and 7, we first need to find the prime factorization of each number. The prime factorization of 9 is 3^2, 21 is 3*7, and 7 is a prime number itself. To find the LCM, we take the highest power of each prime factor that appears in any of the numbers: 3^2 * 7 = 63. Therefore, the least common multiple of 9, 21, and 7 is 63.