It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 378 is not a prime number.
For example, 402 378 can be divided by 2: 402 378 / 2 = 201 189.
For 402 378 to be a prime number, it would have been required that 402 378 has only two divisors, i.e., itself and 1.
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402 378 is an even number, because it is evenly divisible by 2: 402 378 / 2 = 201 189.
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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 402 378 is about 634.333.
Thus, the square root of 402 378 is not an integer, and therefore 402 378 is not a square number.
The square of a number (here 402 378) is the result of the product of this number (402 378) by itself (i.e., 402 378 × 402 378); the square of 402 378 is sometimes called "raising 402 378 to the power 2", or "402 378 squared".
The square of 402 378 is 161 908 054 884 because 402 378 × 402 378 = 402 3782 = 161 908 054 884.
As a consequence, 402 378 is the square root of 161 908 054 884.
The multiples of 402 378 are all integers evenly divisible by 402 378, that is all numbers such that the remainder of the division by 402 378 is zero. There are infinitely many multiples of 402 378. The smallest multiples of 402 378 are: