It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 27 042 021 is not a prime number.
For example, 27 042 021 can be divided by 3: 27 042 021 / 3 = 9 014 007.
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For 27 042 021 to be a prime number, it would have been required that 27 042 021 has only two divisors, i.e., itself and 1.
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27 042 021 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 27 042 021 is about 5 200.194.
Thus, the square root of 27 042 021 is not an integer, and therefore 27 042 021 is not a square number.
The square of a number (here 27 042 021) is the result of the product of this number (27 042 021) by itself (i.e., 27 042 021 × 27 042 021); the square of 27 042 021 is sometimes called "raising 27 042 021 to the power 2", or "27 042 021 squared".
The square of 27 042 021 is 731 270 899 764 441 because 27 042 021 × 27 042 021 = 27 042 0212 = 731 270 899 764 441.
As a consequence, 27 042 021 is the square root of 731 270 899 764 441.
27 042 021 is a number with 8 digits.
The multiples of 27 042 021 are all integers evenly divisible by 27 042 021, that is all numbers such that the remainder of the division by 27 042 021 is zero. There are infinitely many multiples of 27 042 021. The smallest multiples of 27 042 021 are: