It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 721 698 is not a prime number.
For example, 721 698 can be divided by 2: 721 698 / 2 = 360 849.
For 721 698 to be a prime number, it would have been required that 721 698 has only two divisors, i.e., itself and 1.
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721 698 is an even number, because it is evenly divisible by 2: 721 698 / 2 = 360 849.
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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 721 698 is about 849.528.
Thus, the square root of 721 698 is not an integer, and therefore 721 698 is not a square number.
The square of a number (here 721 698) is the result of the product of this number (721 698) by itself (i.e., 721 698 × 721 698); the square of 721 698 is sometimes called "raising 721 698 to the power 2", or "721 698 squared".
The square of 721 698 is 520 848 003 204 because 721 698 × 721 698 = 721 6982 = 520 848 003 204.
As a consequence, 721 698 is the square root of 520 848 003 204.
The multiples of 721 698 are all integers evenly divisible by 721 698, that is all numbers such that the remainder of the division by 721 698 is zero. There are infinitely many multiples of 721 698. The smallest multiples of 721 698 are: