It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 318 402 is not a prime number.
For example, 318 402 can be divided by 2: 318 402 / 2 = 159 201.
For 318 402 to be a prime number, it would have been required that 318 402 has only two divisors, i.e., itself and 1.
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318 402 is an even number, because it is evenly divisible by 2: 318 402 / 2 = 159 201.
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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 318 402 is about 564.271.
Thus, the square root of 318 402 is not an integer, and therefore 318 402 is not a square number.
The square of a number (here 318 402) is the result of the product of this number (318 402) by itself (i.e., 318 402 × 318 402); the square of 318 402 is sometimes called "raising 318 402 to the power 2", or "318 402 squared".
The square of 318 402 is 101 379 833 604 because 318 402 × 318 402 = 318 4022 = 101 379 833 604.
As a consequence, 318 402 is the square root of 101 379 833 604.
The multiples of 318 402 are all integers evenly divisible by 318 402, that is all numbers such that the remainder of the division by 318 402 is zero. There are infinitely many multiples of 318 402. The smallest multiples of 318 402 are: