Is 47728921 a prime number?
It is possible to find out using mathematical methods whether a given integer is a prime number or not.
Yes, 47 728 921 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 47 728 921, the only two divisors are 1 and 47 728 921. Therefore 47 728 921 is a prime number.
As a consequence, 47 728 921 is only a multiple of 1 and 47 728 921.
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Since 47728921 is a prime number, 47728921 is also a deficient number, that is to say 47728921 is a natural integer that is strictly larger than the sum of its proper divisors, i.e., the divisors of 47728921 without 47728921 itself (that is 1, by definition!).