It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 42 318 is not a prime number.
For example, 42 318 can be divided by 2: 42 318 / 2 = 21 159.
For 42 318 to be a prime number, it would have been required that 42 318 has only two divisors, i.e., itself and 1.
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42 318 is an even number, because it is evenly divisible by 2: 42 318 / 2 = 21 159.
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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 42 318 is about 205.713.
Thus, the square root of 42 318 is not an integer, and therefore 42 318 is not a square number.
The square of a number (here 42 318) is the result of the product of this number (42 318) by itself (i.e., 42 318 × 42 318); the square of 42 318 is sometimes called "raising 42 318 to the power 2", or "42 318 squared".
The square of 42 318 is 1 790 813 124 because 42 318 × 42 318 = 42 3182 = 1 790 813 124.
As a consequence, 42 318 is the square root of 1 790 813 124.
The multiples of 42 318 are all integers evenly divisible by 42 318, that is all numbers such that the remainder of the division by 42 318 is zero. There are infinitely many multiples of 42 318. The smallest multiples of 42 318 are: