It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 216 213 is not a prime number.
For example, 216 213 can be divided by 3: 216 213 / 3 = 72 071.
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For 216 213 to be a prime number, it would have been required that 216 213 has only two divisors, i.e., itself and 1.
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216 213 is an odd number, because it is not evenly divisible by 2.
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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 216 213 is about 464.987.
Thus, the square root of 216 213 is not an integer, and therefore 216 213 is not a square number.
The square of a number (here 216 213) is the result of the product of this number (216 213) by itself (i.e., 216 213 × 216 213); the square of 216 213 is sometimes called "raising 216 213 to the power 2", or "216 213 squared".
The square of 216 213 is 46 748 061 369 because 216 213 × 216 213 = 216 2132 = 46 748 061 369.
As a consequence, 216 213 is the square root of 46 748 061 369.
The multiples of 216 213 are all integers evenly divisible by 216 213, that is all numbers such that the remainder of the division by 216 213 is zero. There are infinitely many multiples of 216 213. The smallest multiples of 216 213 are: