It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 118 is not a prime number.
For example, 402 118 can be divided by 2: 402 118 / 2 = 201 059.
For 402 118 to be a prime number, it would have been required that 402 118 has only two divisors, i.e., itself and 1.
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402 118 is an even number, because it is evenly divisible by 2: 402 118 / 2 = 201 059.
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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 402 118 is about 634.128.
Thus, the square root of 402 118 is not an integer, and therefore 402 118 is not a square number.
The square of a number (here 402 118) is the result of the product of this number (402 118) by itself (i.e., 402 118 × 402 118); the square of 402 118 is sometimes called "raising 402 118 to the power 2", or "402 118 squared".
The square of 402 118 is 161 698 885 924 because 402 118 × 402 118 = 402 1182 = 161 698 885 924.
As a consequence, 402 118 is the square root of 161 698 885 924.
The multiples of 402 118 are all integers evenly divisible by 402 118, that is all numbers such that the remainder of the division by 402 118 is zero. There are infinitely many multiples of 402 118. The smallest multiples of 402 118 are: