2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97
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The prime umbers from 1 to 24 are 2, 3, 5, 7, 11, 13, 17, 19, and 23.
The prime factors of 100 are: 2, 5
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.
Prime Factors of 100 = 2, 2, 5, 5.
As a product of its prime factors: 225*5 = 100