It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 721 531 is not a prime number.
For example, 721 531 can be divided by 17: 721 531 / 17 = 42 443.
For 721 531 to be a prime number, it would have been required that 721 531 has only two divisors, i.e., itself and 1.
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721 531 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 721 531 is about 849.430.
Thus, the square root of 721 531 is not an integer, and therefore 721 531 is not a square number.
The square of a number (here 721 531) is the result of the product of this number (721 531) by itself (i.e., 721 531 × 721 531); the square of 721 531 is sometimes called "raising 721 531 to the power 2", or "721 531 squared".
The square of 721 531 is 520 606 983 961 because 721 531 × 721 531 = 721 5312 = 520 606 983 961.
As a consequence, 721 531 is the square root of 520 606 983 961.
The multiples of 721 531 are all integers evenly divisible by 721 531, that is all numbers such that the remainder of the division by 721 531 is zero. There are infinitely many multiples of 721 531. The smallest multiples of 721 531 are: