It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 721 164 is not a prime number.
For example, 721 164 can be divided by 2: 721 164 / 2 = 360 582.
For 721 164 to be a prime number, it would have been required that 721 164 has only two divisors, i.e., itself and 1.
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721 164 is an even number, because it is evenly divisible by 2: 721 164 / 2 = 360 582.
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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 721 164 is about 849.214.
Thus, the square root of 721 164 is not an integer, and therefore 721 164 is not a square number.
The square of a number (here 721 164) is the result of the product of this number (721 164) by itself (i.e., 721 164 × 721 164); the square of 721 164 is sometimes called "raising 721 164 to the power 2", or "721 164 squared".
The square of 721 164 is 520 077 514 896 because 721 164 × 721 164 = 721 1642 = 520 077 514 896.
As a consequence, 721 164 is the square root of 520 077 514 896.
The multiples of 721 164 are all integers evenly divisible by 721 164, that is all numbers such that the remainder of the division by 721 164 is zero. There are infinitely many multiples of 721 164. The smallest multiples of 721 164 are: