It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 216 316 is not a prime number.
For example, 216 316 can be divided by 2: 216 316 / 2 = 108 158.
For 216 316 to be a prime number, it would have been required that 216 316 has only two divisors, i.e., itself and 1.
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216 316 is an even number, because it is evenly divisible by 2: 216 316 / 2 = 108 158.
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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 216 316 is about 465.098.
Thus, the square root of 216 316 is not an integer, and therefore 216 316 is not a square number.
The square of a number (here 216 316) is the result of the product of this number (216 316) by itself (i.e., 216 316 × 216 316); the square of 216 316 is sometimes called "raising 216 316 to the power 2", or "216 316 squared".
The square of 216 316 is 46 792 611 856 because 216 316 × 216 316 = 216 3162 = 46 792 611 856.
As a consequence, 216 316 is the square root of 46 792 611 856.
The multiples of 216 316 are all integers evenly divisible by 216 316, that is all numbers such that the remainder of the division by 216 316 is zero. There are infinitely many multiples of 216 316. The smallest multiples of 216 316 are: