It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 427 027 821 is not a prime number.
For example, 427 027 821 can be divided by 3: 427 027 821 / 3 = 142 342 607.
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For 427 027 821 to be a prime number, it would have been required that 427 027 821 has only two divisors, i.e., itself and 1.
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427 027 821 is an odd number, because it is not evenly divisible by 2.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 427 027 821 is about 20 664.651.
Thus, the square root of 427 027 821 is not an integer, and therefore 427 027 821 is not a square number.
The square of a number (here 427 027 821) is the result of the product of this number (427 027 821) by itself (i.e., 427 027 821 × 427 027 821); the square of 427 027 821 is sometimes called "raising 427 027 821 to the power 2", or "427 027 821 squared".
The square of 427 027 821 is 182 352 759 908 008 032 because 427 027 821 × 427 027 821 = 427 027 8212 = 182 352 759 908 008 032.
As a consequence, 427 027 821 is the square root of 182 352 759 908 008 032.
427 027 821 is a number with 9 digits.
The multiples of 427 027 821 are all integers evenly divisible by 427 027 821, that is all numbers such that the remainder of the division by 427 027 821 is zero. There are infinitely many multiples of 427 027 821. The smallest multiples of 427 027 821 are: