Determine whether each polynomial is prime or not . If not determine whether it is a difference of two squares (DOTS), difference of two cubes (DOTC), sum of two cubes (SOTC), perfect square trinomial (PST), or a general quadratic trinomial (GQT).

1) x² - 49
2) 9y² + 4
3) 2x² + 9x +4
4) 6x² + x + 1
5) 16y² - 8y + 1
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