Prime Number

Rumman Ansari Software Engineer 2023-01-19 374 Share

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Prime numbers are the numbers that have only two factors, that are, 1 and the number itself.

Consider an example of number 5, which has only two factors 1 and 5. This means it is a prime number.

Let us take another example of the number 6, which has more than two factors, i.e., 1, 2, 3, and 6. This means 6 is not a prime number.

Now, if we take the example of the number 1, we know that it has only one factor. So, it cannot be a prime number as a prime number should have exactly two factors. This means 1 is neither a prime nor a composite number, it is a unique number.

Prime numbers are the natural numbers (positive integer) greater than 1 with exactly two factors, i.e. 1 and the number itself.

Any whole number greater than 1 that is divisible only by 1 and itself, is defined as a prime number.

Prime Factor

Factors of a number that are prime numbers are called as Prime factors of that number. For example: 2 and 5 are the prime factors of 10.

2 and 3 are the prime factors of 18.

List of Prime Numbers

There are 25 prime numbers from 1 to 100. The complete list of prime numbers from 1 to 100 is given below:

List of Numbers	Prime Numbers
Between 1 and 10	2, 3, 5, 7
Between 11 and 20	11, 13, 17, 19
Between 21 and 30	23, 29
Between 31 and 40	31, 37
Between 41 and 50	41, 43, 47
Between 51 and 100	53, 59, 61, 67, 71, 73, 79, 83, 89, 97