210 is the smallest number having 4 prime factors, 2 x 3 x 5 x 7.
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The total number of prime numbers less than 100 is 25.
Prime numbers are numbers that are divisible by themselves and 1. 1 itself is not regarded as a prime number. With the exception of 2, all prime numbers are odd numbers. Applying this gives the following prime numbers less than 25 :- 2,3,5,7,11,13,17,19 and 23.
There are 49 even numbers less than 100, but only the number 2 is an even prime number less than 100.
The sum of all prime numbers less than ten is 17. Pick a number 18 or higher.
There are 35 prime numbers less than 150.