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Factors of 87 are: 1, 3, 29, and 87. Since it has more factors in addition to '1' and itself, it's composite.
The prime factors of 87 are 3 x 29
The factors of 87 are 1, 3, 29, and 87, so it is a composite number.
It has more than 2 factors; 1, 29, and 87. 29x3=87. Therefore, it is composite.
.87 as a fraction is 87/100