It is irreducible, it can't be factored.
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The mean write the number as an expression of its prime factors. The prime factors of 210 are 2, 3, 5 and 7. 2 x 3 x 5 x 7 is the prime factorization of 210.
a quantity or parameter that does not change its value whatever the value of the variables, under a given set of conditions.
4x^2 + 9 is a prime algebraic expression. Its numerical value may be prime of not - depending on the value of x.For x = 1, the value of the expression is 13 - a prime whereasfor x = 2, the value of the expression is 25 - not a prime.
You try finding a factor. If there is no proper factor, then it is a prime.
When the expression is broken down into its prime factors it is factored completely.