Is 642721843 a prime number?
It is possible to find out using mathematical methods whether a given integer is a prime number or not.
Yes, 642 721 843 is a prime number.
Indeed, the definition of a prime numbers is to have exactly two distinct positive divisors, 1 and itself. A number is a divisor of another number when the remainder of Euclid’s division of the second one by the first one is zero. Concerning the number 642 721 843, the only two divisors are 1 and 642 721 843. Therefore 642 721 843 is a prime number.
As a consequence, 642 721 843 is only a multiple of 1 and 642 721 843.
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Since 642721843 is a prime number, 642721843 is also a deficient number, that is to say 642721843 is a natural integer that is strictly larger than the sum of its proper divisors, i.e., the divisors of 642721843 without 642721843 itself (that is 1, by definition!).
