Is 42 a prime number?

For 42, the answer is: No, 42 is not a prime number. The list of all positive divisors (i.e., the list of all integers that divide 42) is as follows: 1, 2, 3, 6, 7, 14, 21, 42. For 42 to be a prime number, it would have been required that 42 has only two divisors, i.e., itself and 1.

What is a coprime of two relatively prime numbers?

Two numbers are relatively prime (coprime) if they have no common factor greater than 1. The greatest common factor of relatively prime numbers is equal to 1 and the least common multiple of them is equal to the product of these numbers.

What is the meaning of relative prime?

When two numbers have no common factors other than 1. In other words there is no value that you could divide them both by exactly (without any remainder). Relatively Prime is also called „coprime“ or „mutually prime“. Copyright © 2018 MathsIsFun.com.

What is the difference between a prime number and composite number?

A prime number is a number which has exactly two factors i.e. ‘1’ and the number itself. A composite number has more than two factors, which means apart from getting divided by number 1 and itself, it can also be divided by at least one integer or number. We don’t consider the number ‘1’ as a composite number.

Is 12 prime or composite number?

In the same way, 2, 5, 7, 11, 13, 17 are prime numbers. A composite number has more than two factors, which means apart from getting divided by number 1 and itself, it can also be divided by at least one integer or number. We don’t consider ‘1’ as a composite number. 12 is a composite number because it can be divided by 1,2,3,4,6 and 12.

What are the factors in pairs for 42?

We can find the factors in pairs for 42, by multiplying two numbers in a combination to get the result as 42. This can be done as follows: Therefore, the factors of 42 in pairs are (1, 42), (2, 21), (3, 14) and (6, 7). The number 42 is a composite number.