Table of Contents

## Is 3 and 15 a prime number?

No, 15 is not a prime number. For a number to be classified as a prime number, it should have exactly two factors. Since 15 has more than two factors, i.e. 1, 3, 5, 15, it is not a prime number.

## What is the LCM of 3 and 5 and 15?

15

Answer: LCM of 3, 5, and 15 is 15.

**Is 15 a odd number?**

The first 15 odd numbers are 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27 and 29.

**What is the LCM of 5 10 15 and 20?**

60

Answer: LCM of 5, 10, 15, and 20 is 60.

### Is 16 odd or even?

The list of even numbers from 1-100 is as follows: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70,72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98, 100.

### Is 27 an odd number?

The odd numbers from 1 to 100 are: 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99.

**What is the HCF of 3 and 2?**

1

Answer: HCF of 2 and 3 is 1.

**What is the HCF of 3?**

To find the HCF of 3 and 5, we will find the prime factorization of the given numbers, i.e. 3 = 3; 5 = 5. ⇒ There is no common prime factor for 3 and 5. Hence, HCF (3, 5) = 1.

## What are the prime factors of the number 15?

Prime factors of number 15 are: 3, 5 Equcation of 15 is: 3 * 5 The smallest common factor of 15 is number 3 Highest or greatest common factor GCF of 15 is number 5

## Which is a prime number greater than 1?

A prime number is a number greater than 1 that has exactly two factors, while a composite number has more than two factors. For example, 5 can be factorized in only one way, that is, 1 × 5 (OR) 5 × 1. It has only two factors, which are, 1 and 5. Therefore, 5 is a prime number.

**Which is the smallest factor for the number 15?**

The first step is to divide the number 15 with the smallest prime factor,i.e. 2. 15 ÷ 2 = 7.5. But, factors cannot be decimal, therefore, 2 is not the prime factor for 15. Now, proceed to the next prime number, i.e. 3. 15 ÷ 3 = 5.

**Is the number 13 a prime number or not?**

So 15 is not a prime number. The number 13 has only two divisors of 1,13. 13/1=13. 13/13=1. So 13 is a prime number.