It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 396 378 is not a prime number.
For example, 396 378 can be divided by 2: 396 378 / 2 = 198 189.
For 396 378 to be a prime number, it would have been required that 396 378 has only two divisors, i.e., itself and 1.
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396 378 is an even number, because it is evenly divisible by 2: 396 378 / 2 = 198 189.
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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 396 378 is about 629.586.
Thus, the square root of 396 378 is not an integer, and therefore 396 378 is not a square number.
The square of a number (here 396 378) is the result of the product of this number (396 378) by itself (i.e., 396 378 × 396 378); the square of 396 378 is sometimes called "raising 396 378 to the power 2", or "396 378 squared".
The square of 396 378 is 157 115 518 884 because 396 378 × 396 378 = 396 3782 = 157 115 518 884.
As a consequence, 396 378 is the square root of 157 115 518 884.
The multiples of 396 378 are all integers evenly divisible by 396 378, that is all numbers such that the remainder of the division by 396 378 is zero. There are infinitely many multiples of 396 378. The smallest multiples of 396 378 are: