some are but most are not. There are actually an infinite number that are, 13, 26, 39, 52, etc. are all divisible by 13.
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a positive integer evenly divisible only by itself and one.
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Any positive integer that is evenly divisible only by itself and one.
Any positive integer that is evenly divisible only by itself and one.
Prime numbers are not divisible by any integer other than themselves and one. So if you can't produce an integer (whole number) by dividing the number by any integer, it's prime. For example, 13 is a prime number. You can't produce 13 by multiplying any integers together except 13 and 1.