Question

Show that 999,973 is not prime without using a calculator or computer.

Answer 1

The number 9,99,973 is not prime number as 13, 61 and 97 are factors of 999973 apart from 1 and the number itself.

Explanation:

We have to check whether 999973 is a prime number or not.

Prime factorization is a method where we break a number into product of prime numbers.

We first prime factorize the given number:

`999973 = 13* 13* 61* 97`

Prime Number:

• A prime number is a natural number greater than 1 that cannot be formed by multiplying two smaller numbers.
• A natural number greater than 1 that is not prime is called a composite number.
• Thus, a prime number cannot have factor other than 1 and the number itself.

Thus, we can say that the number 9,99,973 is not prime number as 13, 61 and 97 are factors of 999973 apart from 1 and the number itself.