It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 378 016 is not a prime number.
For example, 378 016 can be divided by 2: 378 016 / 2 = 189 008.
For 378 016 to be a prime number, it would have been required that 378 016 has only two divisors, i.e., itself and 1.
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378 016 is an even number, because it is evenly divisible by 2: 378 016 / 2 = 189 008.
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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 378 016 is about 614.830.
Thus, the square root of 378 016 is not an integer, and therefore 378 016 is not a square number.
The square of a number (here 378 016) is the result of the product of this number (378 016) by itself (i.e., 378 016 × 378 016); the square of 378 016 is sometimes called "raising 378 016 to the power 2", or "378 016 squared".
The square of 378 016 is 142 896 096 256 because 378 016 × 378 016 = 378 0162 = 142 896 096 256.
As a consequence, 378 016 is the square root of 142 896 096 256.
The multiples of 378 016 are all integers evenly divisible by 378 016, that is all numbers such that the remainder of the division by 378 016 is zero. There are infinitely many multiples of 378 016. The smallest multiples of 378 016 are: