It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 685 316 is not a prime number.
For example, 685 316 can be divided by 2: 685 316 / 2 = 342 658.
For 685 316 to be a prime number, it would have been required that 685 316 has only two divisors, i.e., itself and 1.
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685 316 is an even number, because it is evenly divisible by 2: 685 316 / 2 = 342 658.
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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 685 316 is about 827.838.
Thus, the square root of 685 316 is not an integer, and therefore 685 316 is not a square number.
The square of a number (here 685 316) is the result of the product of this number (685 316) by itself (i.e., 685 316 × 685 316); the square of 685 316 is sometimes called "raising 685 316 to the power 2", or "685 316 squared".
The square of 685 316 is 469 658 019 856 because 685 316 × 685 316 = 685 3162 = 469 658 019 856.
As a consequence, 685 316 is the square root of 469 658 019 856.
The multiples of 685 316 are all integers evenly divisible by 685 316, that is all numbers such that the remainder of the division by 685 316 is zero. There are infinitely many multiples of 685 316. The smallest multiples of 685 316 are: