It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 42 168 is not a prime number.
For example, 42 168 can be divided by 2: 42 168 / 2 = 21 084.
For 42 168 to be a prime number, it would have been required that 42 168 has only two divisors, i.e., itself and 1.
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42 168 is an even number, because it is evenly divisible by 2: 42 168 / 2 = 21 084.
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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 42 168 is about 205.348.
Thus, the square root of 42 168 is not an integer, and therefore 42 168 is not a square number.
The square of a number (here 42 168) is the result of the product of this number (42 168) by itself (i.e., 42 168 × 42 168); the square of 42 168 is sometimes called "raising 42 168 to the power 2", or "42 168 squared".
The square of 42 168 is 1 778 140 224 because 42 168 × 42 168 = 42 1682 = 1 778 140 224.
As a consequence, 42 168 is the square root of 1 778 140 224.
The multiples of 42 168 are all integers evenly divisible by 42 168, that is all numbers such that the remainder of the division by 42 168 is zero. There are infinitely many multiples of 42 168. The smallest multiples of 42 168 are: