They are: 3, 11, 17, 19, 29, 41, 43, 53, 59, 61, 67, 73, 83, 89 and 97.
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All the numbers less than 100 that are the product of exactly three different prime numbers are 30, 42, 66, 70, and 78.
All the numbers less than 100 that are the product of exactly three different prime numbers are 30, 42, 66, 70, and 78.
No square number is a prime number, since it has the number you squared as a factor. There are several square numbers less than 100. Just calculate the squares of all numbers, starting with 1, until you reach or pass 100. Then stop.
There is no simple answer because there is no known pattern to prime numbers. You could try dividing the each number by all the prime numbers less than or equal to its square root. If none of the go into the number then it is a prime.