Is 21431489 a prime number?
It is possible to find out using mathematical methods whether a given integer is a prime number or not.
Yes, 21 431 489 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 21 431 489, the only two divisors are 1 and 21 431 489. Therefore 21 431 489 is a prime number.
As a consequence, 21 431 489 is only a multiple of 1 and 21 431 489.
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Since 21431489 is a prime number, 21431489 is also a deficient number, that is to say 21431489 is a natural integer that is strictly larger than the sum of its proper divisors, i.e., the divisors of 21431489 without 21431489 itself (that is 1, by definition!).
