51 is a composite number. A composite number is a positive integer that has at least one positive divisor other than one or itself. In other words, it can be formed by multiplying two smaller positive integers. For 51, it can be divided evenly by 1, 3, 17, and 51. Since it has divisors other than 1 and itself, it is not a prime number. Prime numbers are numbers greater than 1 that have no positive divisors other than 1 and themselves. Therefore, 51 is classified as a composite number.
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