It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 165 378 is not a prime number.
For example, 165 378 can be divided by 2: 165 378 / 2 = 82 689.
For 165 378 to be a prime number, it would have been required that 165 378 has only two divisors, i.e., itself and 1.
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165 378 is an even number, because it is evenly divisible by 2: 165 378 / 2 = 82 689.
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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 165 378 is about 406.667.
Thus, the square root of 165 378 is not an integer, and therefore 165 378 is not a square number.
The square of a number (here 165 378) is the result of the product of this number (165 378) by itself (i.e., 165 378 × 165 378); the square of 165 378 is sometimes called "raising 165 378 to the power 2", or "165 378 squared".
The square of 165 378 is 27 349 882 884 because 165 378 × 165 378 = 165 3782 = 27 349 882 884.
As a consequence, 165 378 is the square root of 27 349 882 884.
The multiples of 165 378 are all integers evenly divisible by 165 378, that is all numbers such that the remainder of the division by 165 378 is zero. There are infinitely many multiples of 165 378. The smallest multiples of 165 378 are: