prime number noun
mathematics : a number (such as 2, 3, or 5) that can only be exactly divided by itself and by 1
: any integer other than 0 or ± 1 that is not divisible without remainder by any other integers except ± 1 and ± the integer itself
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prime number noun (Concise Encyclopedia)
Any positive integer greater than 1 and exactly divisible only by 1 and itself. The sequence of prime numbers begins 2, 3, 5, 7, 11, 13, 17, 19, 23, 29
but follows no discernible pattern. The issues of the regularities and irregularities in the distribution of primes are among the most important questions in number theory. Primes have been recognized at least since Pythagoras. It has been known that there are infinitely many of them at least since Euclid. The prime-number factors of an integer are the prime numbers whose product is that integer (see fundamental theorem of arithmetic).
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