Is 42787643 a prime number?
It is possible to find out using mathematical methods whether a given integer is a prime number or not.
Yes, 42 787 643 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 42 787 643, the only two divisors are 1 and 42 787 643. Therefore 42 787 643 is a prime number.
As a consequence, 42 787 643 is only a multiple of 1 and 42 787 643.
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Since 42787643 is a prime number, 42787643 is also a deficient number, that is to say 42787643 is a natural integer that is strictly larger than the sum of its proper divisors, i.e., the divisors of 42787643 without 42787643 itself (that is 1, by definition!).