It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 512 423 is not a prime number.
For example, 512 423 can be divided by 107: 512 423 / 107 = 4 789.
For 512 423 to be a prime number, it would have been required that 512 423 has only two divisors, i.e., itself and 1.
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512 423 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 512 423 is about 715.837.
Thus, the square root of 512 423 is not an integer, and therefore 512 423 is not a square number.
The square of a number (here 512 423) is the result of the product of this number (512 423) by itself (i.e., 512 423 × 512 423); the square of 512 423 is sometimes called "raising 512 423 to the power 2", or "512 423 squared".
The square of 512 423 is 262 577 330 929 because 512 423 × 512 423 = 512 4232 = 262 577 330 929.
As a consequence, 512 423 is the square root of 262 577 330 929.
The multiples of 512 423 are all integers evenly divisible by 512 423, that is all numbers such that the remainder of the division by 512 423 is zero. There are infinitely many multiples of 512 423. The smallest multiples of 512 423 are: