It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 709 689 638 is not a prime number.
For example, 709 689 638 can be divided by 2: 709 689 638 / 2 = 354 844 819.
For 709 689 638 to be a prime number, it would have been required that 709 689 638 has only two divisors, i.e., itself and 1.
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709 689 638 is an even number, because it is evenly divisible by 2: 709 689 638 / 2 = 354 844 819.
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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 709 689 638 is about 26 640.001.
Thus, the square root of 709 689 638 is not an integer, and therefore 709 689 638 is not a square number.
The square of a number (here 709 689 638) is the result of the product of this number (709 689 638) by itself (i.e., 709 689 638 × 709 689 638); the square of 709 689 638 is sometimes called "raising 709 689 638 to the power 2", or "709 689 638 squared".
The square of 709 689 638 is 503 659 382 284 571 072 because 709 689 638 × 709 689 638 = 709 689 6382 = 503 659 382 284 571 072.
As a consequence, 709 689 638 is the square root of 503 659 382 284 571 072.
709 689 638 is a number with 9 digits.
The multiples of 709 689 638 are all integers evenly divisible by 709 689 638, that is all numbers such that the remainder of the division by 709 689 638 is zero. There are infinitely many multiples of 709 689 638. The smallest multiples of 709 689 638 are: