It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 316 is not a prime number.
For example, 402 316 can be divided by 2: 402 316 / 2 = 201 158.
For 402 316 to be a prime number, it would have been required that 402 316 has only two divisors, i.e., itself and 1.
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402 316 is an even number, because it is evenly divisible by 2: 402 316 / 2 = 201 158.
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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 402 316 is about 634.284.
Thus, the square root of 402 316 is not an integer, and therefore 402 316 is not a square number.
The square of a number (here 402 316) is the result of the product of this number (402 316) by itself (i.e., 402 316 × 402 316); the square of 402 316 is sometimes called "raising 402 316 to the power 2", or "402 316 squared".
The square of 402 316 is 161 858 163 856 because 402 316 × 402 316 = 402 3162 = 161 858 163 856.
As a consequence, 402 316 is the square root of 161 858 163 856.
The multiples of 402 316 are all integers evenly divisible by 402 316, that is all numbers such that the remainder of the division by 402 316 is zero. There are infinitely many multiples of 402 316. The smallest multiples of 402 316 are: