Numbers can be checked to see if they are primes simply by factoring them. Every Prime number has exactly two factors, 1 and the number itself. If there are more or less than 2 factors, the number is not a prime. 1 has only one factor so it is not a prime, and composite numbers have 3 or more factors.
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They are 239 prime numbers less than 1500.
2, 3 and 5 are prime numbers that are less than 7
the greatest prime numbers that is less than 100 = 97
There are 1229 prime numbers that are less than 10000.
There are 25 prime numbers less than 100