It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 531 216 is not a prime number.
For example, 531 216 can be divided by 2: 531 216 / 2 = 265 608.
For 531 216 to be a prime number, it would have been required that 531 216 has only two divisors, i.e., itself and 1.
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531 216 is an even number, because it is evenly divisible by 2: 531 216 / 2 = 265 608.
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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 531 216 is about 728.846.
Thus, the square root of 531 216 is not an integer, and therefore 531 216 is not a square number.
The square of a number (here 531 216) is the result of the product of this number (531 216) by itself (i.e., 531 216 × 531 216); the square of 531 216 is sometimes called "raising 531 216 to the power 2", or "531 216 squared".
The square of 531 216 is 282 190 438 656 because 531 216 × 531 216 = 531 2162 = 282 190 438 656.
As a consequence, 531 216 is the square root of 282 190 438 656.
The multiples of 531 216 are all integers evenly divisible by 531 216, that is all numbers such that the remainder of the division by 531 216 is zero. There are infinitely many multiples of 531 216. The smallest multiples of 531 216 are: