It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 102 is not a prime number.
For example, 402 102 can be divided by 2: 402 102 / 2 = 201 051.
For 402 102 to be a prime number, it would have been required that 402 102 has only two divisors, i.e., itself and 1.
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402 102 is an even number, because it is evenly divisible by 2: 402 102 / 2 = 201 051.
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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 402 102 is about 634.115.
Thus, the square root of 402 102 is not an integer, and therefore 402 102 is not a square number.
The square of a number (here 402 102) is the result of the product of this number (402 102) by itself (i.e., 402 102 × 402 102); the square of 402 102 is sometimes called "raising 402 102 to the power 2", or "402 102 squared".
The square of 402 102 is 161 686 018 404 because 402 102 × 402 102 = 402 1022 = 161 686 018 404.
As a consequence, 402 102 is the square root of 161 686 018 404.
The multiples of 402 102 are all integers evenly divisible by 402 102, that is all numbers such that the remainder of the division by 402 102 is zero. There are infinitely many multiples of 402 102. The smallest multiples of 402 102 are: