3 x 5 x 7 is the prime factorization of 105.
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Because 100 only has one prime factorization.Because each composite whole number has a unique prime factorization.
13 and 19 are prime. 33 and 45 are composite.
There are four of each.
9 is the smallest natural number that is odd and composite: 9=3*3. 15 is the smallest natural number that is odd and a product of two numbers different from one and from each other: 15=3*5.
If you can arrange the counters in the shape of a rectangle with at least two in each row and each column then the number is composite. The numbers of row and the numbers of columns are factors of the given number. If the only rectangle you can make is the "degenerate" one, with only one row or only one column, then the number is prime.