We know that odd numbers are those numbers that are not divisible by 2. Odd prime numbers are those prime numbers that are odd. Therefore, 2 is a prime number and it is the only even prime number. Otherwise, all even numbers have more than 2 factors. This is because 2 is the only even number that has only 2 factors, 1 and 2. Interestingly, there is only 1 even prime number which is 2.
Even Prime Numbers from 1 to 100Įven prime numbers means prime numbers that are even.
So, there are total 25 prime numbers up to 100. Observe the list of prime numbers up to 100 given below.
Step 6: After this step, when all the multiples are crossed out, only the prime numbers will be left uncrossed and these are the numbers marked yellow in the following chart. Step 5: 7 is the next number in the list after 5 the next step would be to cross out all the multiples of 7 in the list, such as 14, 21, 28, 35, 42, 49, 56, 63 and so on up to 100. Step 4: 5 is the next number in the list after 3 cross out all the multiples of 5 in the list, such as 10, 15, 20, 25, 30 and so on up to 100. Step 3: 3 is the next number in the list after 2 cross out all the multiples of 3 in the list, such as 6, 9,12, 15, 18, 21, 24 and so on up to 100. The number 2 is the first number in the list and it is a prime number too cross out all the multiples of 2 in the list. 
Step 2: Ignore the number 1 and start from 2. Step 1: First create a list of numbers from 2 to 100 as shown in the figure given below. Leave the number 1 as all prime numbers are greater than one. The following steps show how to find all the prime numbers up to 100 by Eratosthenes' method. It is an ancient method for finding all the prime numbers up to any given limit. We can find prime numbers in mathematics by using an ancient technique, that is, the sieve of Eratosthenes.
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