None because they are prime numbers.
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4 and 9 are two composite numbers that each have only one other factor besides 1 and themselves. The factors of 4 are 1, 2, and 4, and the factors of 9 are 1, 3, and 9.
I think so. If it has any other factors besides ' 1 ' and 32, then it's composite. Let's see if we can find any others. The factors of 32 are: 1, 2, 4, 8, 16, and 32. Yes, there are other factors besides ' 1 ' and 32, so it's composite.
A number that has only one and itself as factors is a prime number and so therefore it can't have four other identical factors.
A prime number is a number with two and only two factors: 1 (also known as unity) and itself. A composite number is a number with more than two factors; in other words, it has at least one factor besides 1 and itself. 19 does not have any factors besides 1 and itself, so it is a prime number.
37 has no other factors besides ' 1 ' and itself, so it's a prime number.