Is 142 a prime number?

The number 142 has got 4 factors, that are capable of dividing the number completely without leaving any remainder. Thus, the number 142 is a non-prime number. The factors of 142 include 1, 2, 71, and 142.

A number to be a prime number should follow the criteria, which is that it should not have factors more than 2. Here, 142 has more than 2 factors, hence making it a composite number.

Given below are a few ways that can be used to find prime or composite numbers.

The different methods we can use to check if a number is a prime number are explained below:

1. Counting Divisors Method
2. Divisibility Test
3. Prime Number Chart
4. Prime Factorization
    

For the counting divisors method, it is to be checked whether the number is divisible by any numbers other than 1 and the number itself.

The counting divisors method for 142 would simply be:

Divisors of 142 = 1, 2, 71, 142
Number of divisors = 4

The number 142 can be considered composite.
 

In the division test, we try to divide the number by any of the prime numbers. If we cannot, then it is considered a prime number.

In the divisibility method, the prime number only has 2 divisors, which are 1 and itself.

The divisors of 142 are 1, 2, 71, and 142.

Thus, 142 consists of 4 factors that divide it completely without any remainder

The prime number chart is the list of prime numbers starting from 2 to infinity.

The list of prime numbers under 100 are:

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97.

142 is not present in the list, so it is not a prime number.
 

This method is only used for a non-prime number/composite number. Since 142 is a composite number, the prime factorization for 142 is:

Factors of 142 = 2 × 71
 

• Prime Number: A number greater than 1 that has only two divisors: 1 and itself. Example: 2, 3, 5, and 7 are prime numbers.

• Composite Number: A number that has more than two divisors. It is the opposite of a prime number. Example: 4, 6, and 142 are composite numbers.

• Divisibility: A number is divisible by another if the result of the division is a whole number without any remainder. For example, 142 is divisible by 2 because 142 ÷ 2 = 71.

• Divisors: Numbers that divide a given number exactly, without leaving a remainder. For 142, the divisors are 1, 2, 71, and 142.

• Prime Factorization: The process of expressing a number as the product of its prime factors. For example, the prime factorization of 142 is 2 × 71.