Is 213977831 a prime number?
It is possible to find out using mathematical methods whether a given integer is a prime number or not.
Yes, 213 977 831 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 213 977 831, the only two divisors are 1 and 213 977 831. Therefore 213 977 831 is a prime number.
As a consequence, 213 977 831 is only a multiple of 1 and 213 977 831.
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Since 213977831 is a prime number, 213977831 is also a deficient number, that is to say 213977831 is a natural integer that is strictly larger than the sum of its proper divisors, i.e., the divisors of 213977831 without 213977831 itself (that is 1, by definition!).