It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 402 is not a prime number.
For example, 402 402 can be divided by 2: 402 402 / 2 = 201 201.
For 402 402 to be a prime number, it would have been required that 402 402 has only two divisors, i.e., itself and 1.
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402 402 is an even number, because it is evenly divisible by 2: 402 402 / 2 = 201 201.
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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 402 402 is about 634.352.
Thus, the square root of 402 402 is not an integer, and therefore 402 402 is not a square number.
The square of a number (here 402 402) is the result of the product of this number (402 402) by itself (i.e., 402 402 × 402 402); the square of 402 402 is sometimes called "raising 402 402 to the power 2", or "402 402 squared".
The square of 402 402 is 161 927 369 604 because 402 402 × 402 402 = 402 4022 = 161 927 369 604.
As a consequence, 402 402 is the square root of 161 927 369 604.
The multiples of 402 402 are all integers evenly divisible by 402 402, that is all numbers such that the remainder of the division by 402 402 is zero. There are infinitely many multiples of 402 402. The smallest multiples of 402 402 are: