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21 has factors other than 1 and itself, so it is not a prime number. For example, it is divisible by 3. (You can check this by adding the digits of the number: 2 + 1 = 3. If the sum of the digits is divisible by 3, the number is also divisible by 3.) Therefore, 21 is a composite number.
What else can I help you with?
Can you explain why the prime factorization of 42 is 21 2?
In actual fact, the prime factorization of 42 is not 21 x 2, as 21 is not a prime number. The complete prime factorization of 42 is 2 x 3 x 7.
Is number 21 prime or composite?
number 21 is prime
Is the prime number 21 is a prime number?
21 is a composite number, not a prime, having prime factors 3x7.
Is 21 seven a prime number?
21 is the product of two prime numbers, three and seven. A prime number is defined as a number divisible only by one or itself. So ... NO ... 21 is not a prime number.
Is 21 and 31 a prime number?
21 is composite number that is a multiple of 3. 31 is a prime number.
Can you explain why the prime factorization of 42 is 21 2?
In actual fact, the prime factorization of 42 is not 21 x 2, as 21 is not a prime number. The complete prime factorization of 42 is 2 x 3 x 7.
Is number 21 prime or composite?
number 21 is prime
Is the prime number 21 is a prime number?
21 is a composite number, not a prime, having prime factors 3x7.
Are 21 and 11 prime numbers?
11 is a prime number but 21 is not a prime number as it is divisible by 3.
Is 21 a prime number?
A prime number is any integer evenly divisible by only itself, and the number 1. Since 21 is divisible by 3 and 7, it is a composite number, not a prime number.No, 21 is not a prime number.21 is divisible by 1, 3, 7, & 21No. 21=3*7
Is 21 seven a prime number?
21 is the product of two prime numbers, three and seven. A prime number is defined as a number divisible only by one or itself. So ... NO ... 21 is not a prime number.
Is 21 and 31 a prime number?
21 is composite number that is a multiple of 3. 31 is a prime number.
Is 21 a factor of a prime number?
No. The only factors of a prime number are 1 and itself. The only way that 21 could be a factor of a prime number is if it were a prime number, but it is not because 21 is also divisible by 3 and 7.
Is the number 21 prime composite or neither?
3 * 7 = 21 21 is not prime
Explain what a prime number is?
A prime number has no factors except itself and 1.
Can a perfect square be a prime number Explain?
No. A prime number is always odd.
Is the number 441 a prime number?
no, 21*21=441
