It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 720 409 is not a prime number.
For example, 720 409 can be divided by 17: 720 409 / 17 = 42 377.
For 720 409 to be a prime number, it would have been required that 720 409 has only two divisors, i.e., itself and 1.
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720 409 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 720 409 is about 848.769.
Thus, the square root of 720 409 is not an integer, and therefore 720 409 is not a square number.
The square of a number (here 720 409) is the result of the product of this number (720 409) by itself (i.e., 720 409 × 720 409); the square of 720 409 is sometimes called "raising 720 409 to the power 2", or "720 409 squared".
The square of 720 409 is 518 989 127 281 because 720 409 × 720 409 = 720 4092 = 518 989 127 281.
As a consequence, 720 409 is the square root of 518 989 127 281.
The multiples of 720 409 are all integers evenly divisible by 720 409, that is all numbers such that the remainder of the division by 720 409 is zero. There are infinitely many multiples of 720 409. The smallest multiples of 720 409 are: