Is 15 and 21 a prime number?

Prime factorization of 15 and 21 is (3 × 5) and (3 × 7) respectively. As visible, 15 and 21 have only one common prime factor i.e. 3. Hence, the GCF of 15 and 21 is 3.

Is 15 and 17 a prime number?

c) 17 and 15 are coprime numbers because they are two successive numbers.

Is 21 and 27 a prime number?

No even number is a prime number (except 2). Hence, 20, 22, 24, 26, 28 and 30 are not prime…

Did 17 is a prime number?

Yes, 17 is a prime number. The number 17 is divisible only by 1 and the number itself. Since 17 has exactly two factors, i.e. 1 and 17, it is a prime number.

Is 21 a prime numbers?

No, 21 is not a prime number. The number 21 is divisible by 1, 3, 7, 21. Since 21 has more than two factors, i.e. 1, 3, 7, 21, it is not a prime number.

What are the first 10 prime numbers?

The first 10 prime numbers are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29.

Which of the following numbers are prime 21?

The number 21 is divisible by 1, 3, 7, 21. For a number to be classified as a prime number, it should have exactly two factors.

How many prime numbers divide the number 21?

So, the prime factors of 21 are 3 and 7, where 2 and 7 are the prime numbers. Prime factorisation of 21 is 3 × 7.

What is a prime number?

A prime number is any integer, or whole number, greater than 1 that is only divisible by 1 and itself. In other words, a prime number only has two factors, 1 and itself. Is 2 a prime number? Yes, 2 is a prime number because it only has two factors, 1 and 2. Is 17 a prime number? Yes, 17 is a prime number because it only has two factors, 1 and 17.

Is 17 a prime number with 2 factors?

Yes, 17 is a prime number because it only has two factors, 1 and 17. Is 51 a prime number? No, 51 is NOT a prime number because it has more than two factors. 51 is a composite number and can be factored by any of the following numbers: 1, 3, 17, 51.

What are the factors of the first ten prime numbers?

If p is a prime, then it’s only factors are necessarily 1 and p itself. Any number which does not follow this is termed as composite numbers, which means that they can be factored into other positive integers. The first ten primes are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29. Note: It should be noted that 1 is a non-prime number.

Is 2 a prime number?

Yes, 2 is a prime number because it only has two factors, 1 and 2. Is 17 a prime number? Yes, 17 is a prime number because it only has two factors, 1 and 17. Is 51 a prime number? No, 51 is NOT a prime number because it has more than two factors. 51 is a composite number and can be factored by any of the following numbers: 1, 3, 17, 51.