It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 521 674 018 is not a prime number.
For example, 521 674 018 can be divided by 2: 521 674 018 / 2 = 260 837 009.
For 521 674 018 to be a prime number, it would have been required that 521 674 018 has only two divisors, i.e., itself and 1.
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521 674 018 is an even number, because it is evenly divisible by 2: 521 674 018 / 2 = 260 837 009.
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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 521 674 018 is about 22 840.184.
Thus, the square root of 521 674 018 is not an integer, and therefore 521 674 018 is not a square number.
The square of a number (here 521 674 018) is the result of the product of this number (521 674 018) by itself (i.e., 521 674 018 × 521 674 018); the square of 521 674 018 is sometimes called "raising 521 674 018 to the power 2", or "521 674 018 squared".
The square of 521 674 018 is 272 143 781 056 264 320 because 521 674 018 × 521 674 018 = 521 674 0182 = 272 143 781 056 264 320.
As a consequence, 521 674 018 is the square root of 272 143 781 056 264 320.
521 674 018 is a number with 9 digits.
The multiples of 521 674 018 are all integers evenly divisible by 521 674 018, that is all numbers such that the remainder of the division by 521 674 018 is zero. There are infinitely many multiples of 521 674 018. The smallest multiples of 521 674 018 are: