It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 397 394 is not a prime number.
For example, 397 394 can be divided by 2: 397 394 / 2 = 198 697.
For 397 394 to be a prime number, it would have been required that 397 394 has only two divisors, i.e., itself and 1.
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397 394 is an even number, because it is evenly divisible by 2: 397 394 / 2 = 198 697.
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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 397 394 is about 630.392.
Thus, the square root of 397 394 is not an integer, and therefore 397 394 is not a square number.
The square of a number (here 397 394) is the result of the product of this number (397 394) by itself (i.e., 397 394 × 397 394); the square of 397 394 is sometimes called "raising 397 394 to the power 2", or "397 394 squared".
The square of 397 394 is 157 921 991 236 because 397 394 × 397 394 = 397 3942 = 157 921 991 236.
As a consequence, 397 394 is the square root of 157 921 991 236.
The multiples of 397 394 are all integers evenly divisible by 397 394, that is all numbers such that the remainder of the division by 397 394 is zero. There are infinitely many multiples of 397 394. The smallest multiples of 397 394 are: