It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 721 004 is not a prime number.
For example, 721 004 can be divided by 2: 721 004 / 2 = 360 502.
For 721 004 to be a prime number, it would have been required that 721 004 has only two divisors, i.e., itself and 1.
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721 004 is an even number, because it is evenly divisible by 2: 721 004 / 2 = 360 502.
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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 721 004 is about 849.120.
Thus, the square root of 721 004 is not an integer, and therefore 721 004 is not a square number.
The square of a number (here 721 004) is the result of the product of this number (721 004) by itself (i.e., 721 004 × 721 004); the square of 721 004 is sometimes called "raising 721 004 to the power 2", or "721 004 squared".
The square of 721 004 is 519 846 768 016 because 721 004 × 721 004 = 721 0042 = 519 846 768 016.
As a consequence, 721 004 is the square root of 519 846 768 016.
The multiples of 721 004 are all integers evenly divisible by 721 004, that is all numbers such that the remainder of the division by 721 004 is zero. There are infinitely many multiples of 721 004. The smallest multiples of 721 004 are: