It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 680 342 is not a prime number.
For example, 680 342 can be divided by 2: 680 342 / 2 = 340 171.
For 680 342 to be a prime number, it would have been required that 680 342 has only two divisors, i.e., itself and 1.
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680 342 is an even number, because it is evenly divisible by 2: 680 342 / 2 = 340 171.
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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 680 342 is about 824.828.
Thus, the square root of 680 342 is not an integer, and therefore 680 342 is not a square number.
The square of a number (here 680 342) is the result of the product of this number (680 342) by itself (i.e., 680 342 × 680 342); the square of 680 342 is sometimes called "raising 680 342 to the power 2", or "680 342 squared".
The square of 680 342 is 462 865 236 964 because 680 342 × 680 342 = 680 3422 = 462 865 236 964.
As a consequence, 680 342 is the square root of 462 865 236 964.
The multiples of 680 342 are all integers evenly divisible by 680 342, that is all numbers such that the remainder of the division by 680 342 is zero. There are infinitely many multiples of 680 342. The smallest multiples of 680 342 are: